Đề thi Olympic Tiếng Anh lớp 9 vòng 10 năm 2013 - 2014

Câu 1

A car rental agency charges $15 a day plus $0.12 per mile for its rental cars. If these charges include tax, what is the total cost of traveling 400 miles in 3 days in a car rented from this agency?

Câu 2

In the figure above, what is the value of x?

Câu 3

The ratio of toggle-bolt prices in year X to toggle-bolt prices in year Y was 4 to 3. If the ratio of prices in year Y to prices in year Z was 3 to 2, what was the ratio of prices in year X to prices in year Z?

Câu 4

A group of 110 people is divided into 4 committees. If each committee contains at least 2 people, which of the following statements must be true?

Câu 5

In the cube above, AB = 4. What is the perimeter of rectangle ABCD?

Câu 6

The integer n is formed by writing the positive integers in a row, starting with 1 and ending with 80, as shown n = 1234567891011 ... 787980. Counting from the left, what is the 90th digit of n?

Câu 7

What are all possible values of x for which (x + x + x + x + x)/2x = 5/2?

Câu 8

If 2x + 3y = 1, what is x/2 + y/3 in terms of y?

Câu 9

The figure above shows six right triangles. What is the value of x² + y²?

Câu 10

For positive integers x, let the symbol (x) represent the sum of the digits of x. For example, (74) = 7 + 4 = 11. If n is a positive integer and (n) = (33) + (17), which of the following could be the value of n?