Question 1
What is the value of when ?
Solution
Question 2
The harmonic mean of two numbers can be calculated as twice their product divided by their sum. The harmonic mean of and is closest to which integer?
Solution
Question 3
Let . What is the value of ?
Solution
Question 4
The ratio of the measures of two acute angles is , and the complement of one of these two angles is twice as large as the complement of the other. What is the sum of the degree measures of the two angles?
Solution
Question 5
The War of started with a declaration of war on Thursday, June , . The peace treaty to end the war was signed days later, on December , . On what day of the week was the treaty signed?
Solution
Question 6
All three vertices of lie on the parabola defined by , with at the origin and parallel to the -axis. The area of the triangle is . What is the length of ?
Solution
Question 7
Josh writes the numbers . He marks out , skips the next number , marks out , and continues skipping and marking out the next number to the end of the list. Then he goes back to the start of his list, marks out the first remaining number , skips the next number , marks out , skips , marks out , and so on to the end. Josh continues in this manner until only one number remains. What is that number?
Solution
Question 8
A thin piece of wood of uniform density in the shape of an equilateral triangle with side length inches weighs ounces. A second piece of the same type of wood, with the same thickness, also in the shape of an equilateral triangle, has side length of inches. Which of the following is closest to the weight, in ounces, of the second piece?
Solution
Question 9
Carl decided to fence in his rectangular garden. He bought fence posts, placed one on each of the four corners, and spaced out the rest evenly along the edges of the garden, leaving exactly yards between neighboring posts. The longer side of his garden, including the corners, has twice as many posts as the shorter side, including the corners. What is the area, in square yards, of Carl???s garden?
Solution
Question 10
A quadrilateral has vertices , , , and , where and are integers with . The area of is . What is ?
Solution
Question 11
How many squares whose sides are parallel to the axes and whose vertices have coordinates that are integers lie entirely within the region bounded by the line , the line and the line
Solution 1
Let's consider 4 cases:
1. Side of square = 1
When X0 = 1, we can move Y0 to 0-2 without making Y1 1-3 go above pi * X0 = 3.14 (3 possibilities)
When X0 = 2, we can move Y0 to 0-5 without making Y1 2-6 go above pi * X0 = 6.28 (6 possibilities)
When X0 = 3, we can move Y0 to 0-8 without making Y1 1-9 go above pi * X0 = 9.42 (9 possibilities)
When X0 = 4, we can move Y0 to 0-11 without making Y1 1-12 go above pi * X0 = 12.56 (12 possibilities)
2. Side of square = 2
When X0 = 1, we can move Y0 to 0,1 without making Y1 2,3 go above pi * X0 = 3.14 (2 possibilities)
When X0 = 2, we can move Y0 to 0,1,2,3,4 without making Y1 2,3,4,5,6 go above pi * X0 = 6.28 (5 possibilities)
When X0 = 3, we can move Y0 to 0-7 without making Y1 2-9 go above pi * X0 = 9.42 (8 possibilities)
When X0 = 4, X1=6, so out of range horizontally
3. Side of square = 3
When X0 = 1, we can move Y0 to 0 without making Y1 3 go above pi * X0 = 3.14 (1 possibilities)
When X0 = 2, we can move Y0 to 0,1,2,3 without making Y1 3,4,5,6 go above pi * X0 = 6.28 (4 possibilities)
When X0 = 3, X1=6, so out of range horizontally
4. Side of square = 4
Out of range horizontally or vertically no matter how you place the square.
Solution 2
Question 12
All the numbers are written in a array of squares, one number in each square, in such a way that if two numbers are consecutive then they occupy squares that share an edge. The numbers in the four corners add up to . What is the number in the center?
Solution
Question 13
Alice and Bob live miles apart. One day Alice looks due north from her house and sees an airplane. At the same time Bob looks due west from his house and sees the same airplane. The angle of elevation of the airplane is from Alice's position and from Bob's position. Which of the following is closest to the airplane's altitude, in miles?
Solution
Question 14
The sum of an infinite geometric series is a positive number , and the second term in the series is . What is the smallest possible value of
Solution
Question 15
All the numbers are assigned to the six faces of a cube, one number to each face. For each of the eight vertices of the cube, a product of three numbers is computed, where the three numbers are the numbers assigned to the three faces that include that vertex. What is the greatest possible value of the sum of these eight products?
Solution
Question 16
In how many ways can be written as the sum of an increasing sequence of two or more consecutive positive integers?
Solution
Question 17
In shown in the figure, , , , and is an altitude. Points and lie on sides and , respectively, so that and are angle bisectors, intersecting at and , respectively. What is ?
Solution
https://www.homesweetlearning.com/resources/math/math910/geometry/areas.html
From Herons' formula, we will know the area of triangle ABC is 12 * square root of 5.
Then we will know Height AH = 3 * square root of 5
Then applying Pythagorean Theorem to triangle ABH, we will know BH=2, then we will know CH=6
Apply angle bisector theorem on triangle ACH, we get AP:PH = 9:6
Apply angle bisector theorem on triangle ABH, we get AQ:QH = 7:2.
Now you can figure out PQ:
PH = QH+PQ
AQ = AP+PQ
AP/(QH+PQ) = 9/6
(AP+PQ)/QH = 7/2
AP+PQ+QH=3 * square root of 5
Question 18
What is the area of the region enclosed by the graph of the equation
Solution
Question 19
Tom, Dick, and Harry are playing a game. Starting at the same time, each of them flips a fair coin repeatedly until he gets his first head, at which point he stops. What is the probability that all three flip their coins the same number of times?
Solution
Question 20
A set of teams held a round-robin tournament in which every team played every other team exactly once. Every team won games and lost games; there were no ties. How many sets of three teams were there in which beat , beat , and beat
Solution
Question 21
Let be a unit square. Let be the midpoint of . For let be the intersection of and , and let be the foot of the perpendicular from to . What is
Solution
Question 22
For a certain positive integer less than , the decimal equivalent of is , a repeating decimal of period of , and the decimal equivalent of is , a repeating decimal of period . In which interval does lie?
Solution
Question 23
What is the volume of the region in three-dimensional space defined by the inequalities and ?
Solution
Question 24
There are exactly ordered quadruplets such that and . What is the smallest possible value for ?
Solution
Question 25
The sequence is defined recursively by , , and for . What is the smallest positive integer such that the product is an integer?
Solution
Answer Keys
Question 1: D
Question 2: A
Question 3: D
Question 4: C
Question 5: B
Question 6: C
Question 7: D
Question 8: D
Question 9: B
Question 10: A
Question 11: D
Question 12: C
Question 13: E
Question 14: E
Question 15: D
Question 16: E
Question 17: D
Question 18: B
Question 19: B
Question 20: A
Question 21: B
Question 22: B
Question 23: A
Question 24: D
Question 25: A