Bluebook SAT Test Percentages Ratios and Proportions 1

Question 1

A shirt originally costs $40 and is on sale for 25% off. What is the sale price?

Accepted Answer

$30

Answer

Discount = 25% × $40 = $10. Sale price = $40 − $10 = $30.

Question 2

A car travels 240 miles in 4 hours. At the same rate, how many miles will it travel in 7 hours?

Accepted Answer

420

Answer

Rate = 240/4 = 60 mph. Distance in 7 hours = 60 × 7 = 420 miles.

Question 3

The ratio of boys to girls in a class is 3:5. If there are 24 boys, how many girls are there?

Accepted Answer

40

Answer

3/5 = 24/x → x = 24 × 5/3 = 40.

Question 4

A population increased from 4,000 to 5,200. What is the percent increase?

Accepted Answer

30%

Answer

Percent increase = (change/original) × 100 = (1200/4000) × 100 = 30%.

Question 5

If 3 apples cost $1.50, how much do 10 apples cost?

Accepted Answer

$5.00

Answer

Cost per apple = $1.50/3 = $0.50. 10 apples = 10 × $0.50 = $5.00.

Bluebook SAT Practice Test