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5,600
For each positive integer $n$, define $S(n)$ to be the smallest positive integer divisible by each of the positive integers $1, 2, 3, \ldots, n$. How many positive integers $n$ with $1 \leq n \leq 100$ have $S(n) = S(n+4)$?
11
0.78125
5,601
What is the perimeter of $\triangle UVZ$ if $UVWX$ is a rectangle that lies flat on a horizontal floor, a vertical semi-circular wall with diameter $XW$ is constructed, point $Z$ is the highest point on this wall, and $UV=20$ and $VW=30$?
86
0
5,602
Lucas chooses one, two or three different numbers from the list $2, 5, 7, 12, 19, 31, 50, 81$ and writes down the sum of these numbers. (If Lucas chooses only one number, this number is the sum.) How many different sums less than or equal to 100 are possible?
41
0
5,603
In a photograph, Aristotle, David, Flora, Munirah, and Pedro are seated in a random order in a row of 5 chairs. If David is seated in the middle of the row, what is the probability that Pedro is seated beside him?
\frac{1}{2}
87.5
5,604
How many points $(x, y)$, with $x$ and $y$ both integers, are on the line with equation $y=4x+3$ and inside the region bounded by $x=25, x=75, y=120$, and $y=250$?
32
96.875
5,605
If $2n + 5 = 16$, what is the value of the expression $2n - 3$?
8
90.625
5,606
Last summer, Pat worked at a summer camp. For each day that he worked, he earned \$100 and he was not charged for food. For each day that he did not work, he was not paid and he was charged \$20 for food. After 70 days, the money that he earned minus his food costs equalled \$5440. On how many of these 70 days did Pat work?
57
87.5
5,607
If $3+\triangle=5$ and $\triangle+\square=7$, what is the value of $\triangle+\Delta+\Delta+\square+\square$?
16
93.75
5,608
Four congruent rectangles and a square are assembled without overlapping to form a large square. Each of the rectangles has a perimeter of 40 cm. What is the total area of the large square?
400 \mathrm{~cm}^{2}
0
5,609
If \( 3x + 4 = x + 2 \), what is the value of \( x \)?
-1
100
5,610
Five students play chess matches against each other. Each student plays three matches against each of the other students. How many matches are played in total?
30
98.4375
5,611
When three positive integers are added in pairs, the resulting sums are 998, 1050, and 1234. What is the difference between the largest and smallest of the three original positive integers?
236
94.53125
5,612
If the line that passes through the points $(2,7)$ and $(a, 3a)$ has a slope of 2, what is the value of $a$?
3
94.53125
5,613
Three $1 imes 1 imes 1$ cubes are joined side by side. What is the surface area of the resulting prism?
14
57.03125
5,614
A cube has six faces. Each face has some dots on it. The numbers of dots on the six faces are 2, 3, 4, 5, 6, and 7. Harry removes one of the dots at random, with each dot equally likely to be removed. When the cube is rolled, each face is equally likely to be the top face. What is the probability that the top face has an odd number of dots on it?
\frac{13}{27}
1.5625
5,615
If a bag contains only green, yellow, and red marbles in the ratio $3: 4: 2$ and 63 of the marbles are not red, how many red marbles are in the bag?
18
96.875
5,616
In a factory, Erika assembles 3 calculators in the same amount of time that Nick assembles 2 calculators. Also, Nick assembles 1 calculator in the same amount of time that Sam assembles 3 calculators. How many calculators in total can be assembled by Nick, Erika, and Sam in the same amount of time as Erika assembles 9 calculators?
33
54.6875
5,617
Three friends are in the park. Bob and Clarise are standing at the same spot and Abe is standing 10 m away. Bob chooses a random direction and walks in this direction until he is 10 m from Clarise. What is the probability that Bob is closer to Abe than Clarise is to Abe?
\frac{1}{3}
11.71875
5,618
The Athenas are playing a 44 game season. They have 20 wins and 15 losses so far. What is the smallest number of their remaining games that they must win to make the playoffs, given they must win at least 60% of all of their games?
7
88.28125
5,619
If the number of zeros in the integer equal to $(10^{100}) imes (100^{10})$ is sought, what is this number?
120
83.59375
5,620
There are $n$ students in the math club. When grouped in 4s, there is one incomplete group. When grouped in 3s, there are 3 more complete groups than with 4s, and one incomplete group. When grouped in 2s, there are 5 more complete groups than with 3s, and one incomplete group. What is the sum of the digits of $n^{2}-n$?
12
33.59375
5,621
How many words are there in a language that are 10 letters long and begin with a vowel, given that the language uses only the letters A, B, C, D, and E, where A and E are vowels, and B, C, and D are consonants, and a word does not include the same letter twice in a row or two vowels in a row?
199776
0
5,622
If $4x + 14 = 8x - 48$, what is the value of $2x$?
31
78.125
5,623
The integers -5 and 6 are shown on a number line. What is the distance between them?
11
96.09375
5,624
The top section of an 8 cm by 6 cm rectangular sheet of paper is folded along a straight line so that when the top section lies flat on the bottom section, corner $P$ lies on top of corner $R$. What is the length of the crease?
7.5
1.5625
5,625
What is the value of $x$ if $P Q S$ is a straight line and $\angle P Q R=110^{\circ}$?
24
0
5,626
The real numbers $x, y$ and $z$ satisfy the three equations $x+y=7$, $xz=-180$, and $(x+y+z)^{2}=4$. If $S$ is the sum of the two possible values of $y$, what is $-S$?
42
66.40625
5,627
How many candies were in the bag before the first day if a group of friends eat candies over five days as follows: On the first day, they eat \( \frac{1}{2} \) of the candies, on the second day \( \frac{2}{3} \) of the remaining, on the third day \( \frac{3}{4} \) of the remaining, on the fourth day \( \frac{4}{5} \) of the remaining, and on the fifth day \( \frac{5}{6} \) of the remaining, leaving 1 candy?
720
89.0625
5,628
The integers \(a, b,\) and \(c\) satisfy the equations \(a + 5 = b\), \(5 + b = c\), and \(b + c = a\). What is the value of \(b\)?
-10
98.4375
5,629
How many interior intersection points are there on a 12 by 12 grid of squares?
121
84.375
5,630
What is the value of $n$ if $2^{n}=8^{20}$?
60
33.59375
5,631
Shuxin begins with 10 red candies, 7 yellow candies, and 3 blue candies. After eating some of the candies, there are equal numbers of red, yellow, and blue candies remaining. What is the smallest possible number of candies that Shuxin ate?
11
61.71875
5,632
Suppose that $x$ and $y$ are real numbers with $-4 \leq x \leq -2$ and $2 \leq y \leq 4$. What is the greatest possible value of $\frac{x+y}{x}$?
\frac{1}{2}
71.09375
5,633
What is the quantity equivalent to '2% of 1'?
\frac{2}{100}
0
5,634
Eugene swam on Sunday, Monday, and Tuesday. On Monday, he swam for 30 minutes. On Tuesday, he swam for 45 minutes. His average swim time over the three days was 34 minutes. For how many minutes did he swim on Sunday?
27
99.21875
5,635
Evaluate the expression $\sqrt{13+\sqrt{7+\sqrt{4}}}$.
4
69.53125
5,636
Positive integers $a$ and $b$ satisfy $a b=2010$. If $a>b$, what is the smallest possible value of $a-b$?
37
9.375
5,637
How many of the numbers in Grace's sequence, starting from 43 and each number being 4 less than the previous one, are positive?
11
98.4375
5,638
How many of the 200 students surveyed said that their favourite food was sandwiches, given the circle graph results?
20
5.46875
5,639
If the perimeter of a square is 28, what is the side length of the square?
7
76.5625
5,640
In triangle $XYZ$, $XY=XZ$ and $W$ is on $XZ$ such that $XW=WY=YZ$. What is the measure of $\angle XYW$?
36^{\circ}
32.03125
5,641
If $(x+a)(x+8)=x^{2}+bx+24$ for all values of $x$, what is the value of $a+b$?
14
78.125
5,642
A tetrahedron of spheres is formed with thirteen layers and each sphere has a number written on it. The top sphere has a 1 written on it and each of the other spheres has written on it the number equal to the sum of the numbers on the spheres in the layer above with which it is in contact. What is the sum of the numbers on all of the internal spheres?
772626
0
5,643
A rectangular piece of paper $P Q R S$ has $P Q=20$ and $Q R=15$. The piece of paper is glued flat on the surface of a large cube so that $Q$ and $S$ are at vertices of the cube. What is the shortest distance from $P$ to $R$, as measured through the cube?
18.4
0
5,644
Storage space on a computer is measured in gigabytes (GB) and megabytes (MB), where $1 \mathrm{~GB} = 1024 \mathrm{MB}$. Julia has an empty 300 GB hard drive and puts 300000 MB of data onto it. How much storage space on the hard drive remains empty?
7200 \mathrm{MB}
0
5,645
If $wxyz$ is a four-digit positive integer with $w \neq 0$, the layer sum of this integer equals $wxyz + xyz + yz + z$. If the layer sum of $wxyz$ equals 2014, what is the value of $w + x + y + z$?
13
82.8125
5,646
The regular price for a bicycle is $\$320$. The bicycle is on sale for $20\%$ off. The regular price for a helmet is $\$80$. The helmet is on sale for $10\%$ off. If Sandra bought both items on sale, what is her percentage savings on the total purchase?
18\%
75.78125
5,647
Suppose that $N = 3x + 4y + 5z$, where $x$ equals 1 or -1, and $y$ equals 1 or -1, and $z$ equals 1 or -1. How many of the following statements are true? - $N$ can equal 0. - $N$ is always odd. - $N$ cannot equal 4. - $N$ is always even.
1
34.375
5,648
How many such nine-digit positive integers can Ricardo make if he wants to arrange three 1s, three 2s, two 3s, and one 4 with the properties that there is at least one 1 before the first 2, at least one 2 before the first 3, and at least one 3 before the 4, and no digit 2 can be next to another 2?
254
0
5,649
If points $P, Q, R$, and $S$ are arranged in order on a line segment with $P Q=1, Q R=2 P Q$, and $R S=3 Q R$, what is the length of $P S$?
9
86.71875
5,650
Two different numbers are randomly selected from the set $\{-3, -1, 0, 2, 4\}$ and then multiplied together. What is the probability that the product of the two numbers chosen is 0?
\frac{2}{5}
94.53125
5,651
What is the number of positive integers $p$ for which $-1<\sqrt{p}-\sqrt{100}<1$?
39
91.40625
5,652
What is the value of $(5 abla 1)+(4 abla 1)$ if the operation $k abla m$ is defined as $k(k-m)$?
32
96.09375
5,653
Two numbers $a$ and $b$ with $0 \leq a \leq 1$ and $0 \leq b \leq 1$ are chosen at random. The number $c$ is defined by $c=2a+2b$. The numbers $a, b$ and $c$ are each rounded to the nearest integer to give $A, B$ and $C$, respectively. What is the probability that $2A+2B=C$?
\frac{7}{16}
2.34375
5,654
If $u=-6$ and $x= rac{1}{3}(3-4 u)$, what is the value of $x$?
9
80.46875
5,655
What is the sum of all numbers $q$ which can be written in the form $q=\frac{a}{b}$ where $a$ and $b$ are positive integers with $b \leq 10$ and for which there are exactly 19 integers $n$ that satisfy $\sqrt{q}<n<q$?
777.5
0
5,656
In $\triangle ABC$, points $D$ and $E$ lie on $AB$, as shown. If $AD=DE=EB=CD=CE$, what is the measure of $\angle ABC$?
30^{\circ}
35.15625
5,657
Find the least possible area of a convex set in the plane that intersects both branches of the hyperbola $xy = 1$ and both branches of the hyperbola $xy = -1$. (A set $S$ in the plane is called \emph{convex} if for any two points in $S$ the line segment connecting them is contained in $S$.)
4
91.40625
5,658
Evaluate \[ \lim_{x \to 1^-} \prod_{n=0}^\infty \left(\frac{1 + x^{n+1}}{1 + x^n}\right)^{x^n}. \]
\frac{2}{e}
0
5,659
For every real number $x$, what is the value of the expression $(x+1)^{2} - x^{2}$?
2x + 1
99.21875
5,660
Suppose that $PQRS TUVW$ is a regular octagon. There are 70 ways in which four of its sides can be chosen at random. If four of its sides are chosen at random and each of these sides is extended infinitely in both directions, what is the probability that they will meet to form a quadrilateral that contains the octagon?
\frac{19}{35}
0
5,661
Let $d_n$ be the determinant of the $n \times n$ matrix whose entries, from left to right and then from top to bottom, are $\cos 1, \cos 2, \dots, \cos n^2$. Evaluate $\lim_{n\to\infty} d_n$.
0
88.28125
5,662
Calculate the value of $(3,1) \nabla (4,2)$ using the operation ' $\nabla$ ' defined by $(a, b) \nabla (c, d)=ac+bd$.
14
100
5,663
The set $S$ consists of 9 distinct positive integers. The average of the two smallest integers in $S$ is 5. The average of the two largest integers in $S$ is 22. What is the greatest possible average of all of the integers of $S$?
16
5.46875
5,664
If each of Bill's steps is $ rac{1}{2}$ metre long, how many steps does Bill take to walk 12 metres in a straight line?
24
95.3125
5,665
Rectangle $W X Y Z$ has $W X=4, W Z=3$, and $Z V=3$. The rectangle is curled without overlapping into a cylinder so that sides $W Z$ and $X Y$ touch each other. In other words, $W$ touches $X$ and $Z$ touches $Y$. The shortest distance from $W$ to $V$ through the inside of the cylinder can be written in the form $\sqrt{\frac{a+b \pi^{2}}{c \pi^{2}}}$ where $a, b$ and $c$ are positive integers. What is the smallest possible value of $a+b+c$?
18
0.78125
5,666
For how many positive integers $n$, with $n \leq 100$, is $n^{3}+5n^{2}$ the square of an integer?
8
63.28125
5,667
Cube $A B C D E F G H$ has edge length 100. Point $P$ is on $A B$, point $Q$ is on $A D$, and point $R$ is on $A F$, as shown, so that $A P=x, A Q=x+1$ and $A R=\frac{x+1}{2 x}$ for some integer $x$. For how many integers $x$ is the volume of triangular-based pyramid $A P Q R$ between $0.04 \%$ and $0.08 \%$ of the volume of cube $A B C D E F G H$?
28
23.4375
5,668
How many foonies are in a stack that has a volume of $50 \mathrm{~cm}^{3}$, given that each foonie has a volume of $2.5 \mathrm{~cm}^{3}$?
20
100
5,669
If $x=11, y=8$, and $2x+3z=5y$, what is the value of $z$?
6
76.5625
5,670
If $x = 2y$ and $y \neq 0$, what is the value of $(x-y)(2x+y)$?
5y^{2}
0
5,671
A sequence consists of 2010 terms. Each term after the first is 1 larger than the previous term. The sum of the 2010 terms is 5307. When every second term is added up, starting with the first term and ending with the second last term, what is the sum?
2151
10.9375
5,672
Alain and Louise are driving on a circular track with radius 25 km. Alain leaves the starting line first, going clockwise at 80 km/h. Fifteen minutes later, Louise leaves the same starting line, going counterclockwise at 100 km/h. For how many hours will Louise have been driving when they pass each other for the fourth time?
\\frac{10\\pi-1}{9}
4.6875
5,673
In a rectangle $P Q R S$ with $P Q=5$ and $Q R=3$, $P R$ is divided into three segments of equal length by points $T$ and $U$. What is the area of quadrilateral $S T Q U$?
5
58.59375
5,674
What is the average (mean) number of hamburgers eaten per student if 12 students ate 0 hamburgers, 14 students ate 1 hamburger, 8 students ate 2 hamburgers, 4 students ate 3 hamburgers, and 2 students ate 4 hamburgers?
1.25
78.90625
5,675
There are 20 students in a class. In total, 10 of them have black hair, 5 of them wear glasses, and 3 of them both have black hair and wear glasses. How many of the students have black hair but do not wear glasses?
7
100
5,676
After a fair die with faces numbered 1 to 6 is rolled, the number on the top face is $x$. What is the most likely outcome?
x > 2
0
5,677
Find the minimum value of $| \sin x + \cos x + \tan x + \cot x + \sec x + \csc x |$ for real numbers $x$.
2\sqrt{2} - 1
17.1875
5,678
Suppose that $x$ and $y$ are positive numbers with $xy=\frac{1}{9}$, $x(y+1)=\frac{7}{9}$, and $y(x+1)=\frac{5}{18}$. What is the value of $(x+1)(y+1)$?
\frac{35}{18}
80.46875
5,679
A rectangle is divided into four smaller rectangles, labelled W, X, Y, and Z. The perimeters of rectangles W, X, and Y are 2, 3, and 5, respectively. What is the perimeter of rectangle Z?
6
10.9375
5,680
Let $S = \{1, 2, \dots, n\}$ for some integer $n > 1$. Say a permutation $\pi$ of $S$ has a \emph{local maximum} at $k \in S$ if \begin{enumerate} \item[(i)] $\pi(k) > \pi(k+1)$ for $k=1$; \item[(ii)] $\pi(k-1) < \pi(k)$ and $\pi(k) > \pi(k+1)$ for $1 < k < n$; \item[(iii)] $\pi(k-1) < \pi(k)$ for $k=n$. \end{enumerate} (For example, if $n=5$ and $\pi$ takes values at $1, 2, 3, 4, 5$ of $2, 1, 4, 5, 3$, then $\pi$ has a local maximum of 2 at $k=1$, and a local maximum of 5 at $k=4$.) What is the average number of local maxima of a permutation of $S$, averaging over all permutations of $S$?
\frac{n+1}{3}
81.25
5,681
For each positive integer $k$, let $A(k)$ be the number of odd divisors of $k$ in the interval $[1, \sqrt{2k})$. Evaluate \[ \sum_{k=1}^\infty (-1)^{k-1} \frac{A(k)}{k}. \]
\frac{\pi^2}{16}
0
5,682
Snacks are purchased for 17 soccer players. Juice boxes come in packs of 3 and cost $2.00 per pack. Apples come in bags of 5 and cost $4.00 per bag. What is the minimum amount of money that Danny spends to ensure every player gets a juice box and an apple?
\$28.00
10.15625
5,683
If $n$ is a positive integer, the notation $n$! (read " $n$ factorial") is used to represent the product of the integers from 1 to $n$. That is, $n!=n(n-1)(n-2) \cdots(3)(2)(1)$. For example, $4!=4(3)(2)(1)=24$ and $1!=1$. If $a$ and $b$ are positive integers with $b>a$, what is the ones (units) digit of $b!-a$! that cannot be?
7
33.59375
5,684
Pablo has 27 solid $1 \times 1 \times 1$ cubes that he assembles in a larger $3 \times 3 \times 3$ cube. If 10 of the smaller cubes are red, 9 are blue, and 8 are yellow, what is the smallest possible surface area of the larger cube that is red?
12
6.25
5,685
Find a nonzero polynomial $P(x,y)$ such that $P(\lfloor a \rfloor, \lfloor 2a \rfloor) = 0$ for all real numbers $a$. (Note: $\lfloor \nu \rfloor$ is the greatest integer less than or equal to $\nu$.)
(y-2x)(y-2x-1)
79.6875
5,686
For all $n \geq 1$, let \[ a_n = \sum_{k=1}^{n-1} \frac{\sin \left( \frac{(2k-1)\pi}{2n} \right)}{\cos^2 \left( \frac{(k-1)\pi}{2n} \right) \cos^2 \left( \frac{k\pi}{2n} \right)}. \] Determine \[ \lim_{n \to \infty} \frac{a_n}{n^3}. \]
\frac{8}{\pi^3}
0
5,687
For how many odd integers $k$ between 0 and 100 does the equation $2^{4m^{2}}+2^{m^{2}-n^{2}+4}=2^{k+4}+2^{3m^{2}+n^{2}+k}$ have exactly two pairs of positive integers $(m, n)$ that are solutions?
18
0
5,688
If $2^{x}=16$, what is the value of $2^{x+3}$?
128
93.75
5,689
Each of $a, b$ and $c$ is equal to a number from the list $3^{1}, 3^{2}, 3^{3}, 3^{4}, 3^{5}, 3^{6}, 3^{7}, 3^{8}$. There are $N$ triples $(a, b, c)$ with $a \leq b \leq c$ for which each of $\frac{ab}{c}, \frac{ac}{b}$ and $\frac{bc}{a}$ is equal to an integer. What is the value of $N$?
86
0
5,690
Let $a$ and $b$ be positive integers for which $45a+b=2021$. What is the minimum possible value of $a+b$?
85
35.9375
5,691
Given a positive integer $n$, let $M(n)$ be the largest integer $m$ such that \[ \binom{m}{n-1} > \binom{m-1}{n}. \] Evaluate \[ \lim_{n \to \infty} \frac{M(n)}{n}. \]
\frac{3+\sqrt{5}}{2}
4.6875
5,692
A pizza is cut into 10 pieces. Two of the pieces are each \(\frac{1}{24}\) of the whole pizza, four are each \(\frac{1}{12}\), two are each \(\frac{1}{8}\), and two are each \(\frac{1}{6}\). A group of \(n\) friends share the pizza by distributing all of these pieces. They do not cut any of these pieces. Each of the \(n\) friends receives, in total, an equal fraction of the whole pizza. What is the sum of the values of \(n\) with \(2 \leq n \leq 10\) for which this is not possible?
39
21.09375
5,693
Four points are chosen uniformly and independently at random in the interior of a given circle. Find the probability that they are the vertices of a convex quadrilateral.
1 - \frac{35}{12 \pi^2}
0
5,694
When a number is tripled and then decreased by 5, the result is 16. What is the original number?
7
100
5,695
The 30 edges of a regular icosahedron are distinguished by labeling them $1,2,\dots,30$. How many different ways are there to paint each edge red, white, or blue such that each of the 20 triangular faces of the icosahedron has two edges of the same color and a third edge of a different color?
61917364224
0
5,696
On the number line, points $M$ and $N$ divide $L P$ into three equal parts. What is the value at $M$?
\frac{1}{9}
0
5,697
Point $P$ is on the $y$-axis with $y$-coordinate greater than 0 and less than 100. A circle is drawn through $P, Q(4,4)$ and $O(0,0)$. How many possible positions for $P$ are there so that the radius of this circle is an integer?
66
0
5,698
Find all positive integers $n, k_1, \dots, k_n$ such that $k_1 + \cdots + k_n = 5n-4$ and \[ \frac{1}{k_1} + \cdots + \frac{1}{k_n} = 1. \]
n = 1, k_1 = 1; n = 3, (k_1,k_2,k_3) = (2,3,6); n = 4, (k_1,k_2,k_3,k_4) = (4,4,4,4)
0
5,699
In her last basketball game, Jackie scored 36 points. These points raised the average number of points that she scored per game from 20 to 21. To raise this average to 22 points, how many points must Jackie score in her next game?
38
82.03125