CBEST Math: Computation and Problem-Solving 3

Question 1

The ratio of boys to girls in a class is 3:4. If there are 28 students total, how many are boys?

Accepted Answer

12

Answer

Boys make up 3/7 of students, so 3/7 × 28 = 12 boys.

Question 2

What is 15% of 240?

Accepted Answer

36

Answer

15% of 240 = 0.15 × 240 = 36.

Question 3

A box contains 3 red, 5 blue, and 2 green marbles. What is the probability of randomly selecting a blue marble?

Accepted Answer

1/2

Answer

There are 5 blue marbles out of 10 total, so probability = 5/10 = 1/2.

Question 4

Evaluate: 48 ÷ (6 − 2) × 3

Accepted Answer

36

Answer

Following order of operations: 48 ÷ 4 × 3 = 12 × 3 = 36.

Question 5

A rectangle has a perimeter of 54 cm. If the length is 16 cm, what is the width?

Accepted Answer

11 cm

Answer

Perimeter = 2(l + w), so 54 = 2(16 + w), giving w = 11 cm.

CBEST - California Basic Educational Skills Test Practice Test