SAT Percent Problems

50 students applied for an internship, 8 were accepted. what percent were rejected?

Charlie bought a $60 radio on sale for 5% off. who much did he pay including a 5% sales tax?

If 120% of a is equal to 80% of b , which of the following is equal to a + b?

If the radius of circle O is 10, what is the length of diagonal AC of rectangle OABC?

If a + 2b = 14 and 5a + 4b = 16, what is the average of a and b?

(see question)

9 is 1/3% of what number?

If 12a + 3b = 1 and 7b - 2a = 9, what is the average of a and b?

(see question)

If x% of y is 10, what is y?

A jar has 2,000 marbles. If 61.5% red, 27.2% white, and 10% blue, how many are neither?

What is a divided by a% of a?

Twice boys as girls. If 30% girls & 45% boys turned in HW, what % of students not turned in HW?

OPQR is a square. If the area of the square is 8, find area of the circle.

If 5x + 13 = 31, what is the value of √(5x+31)?