CBEST Math: Computation and Problem-Solving 3 — Questions and Answers
Question 1: The ratio of boys to girls in a class is 3:4. If there are 28 students total, how many are boys?
- 10
- 12 (Correct answer)
- 14
- 16
Correct answer: 12
Boys make up 3/7 of students, so 3/7 × 28 = 12 boys.
Question 2: What is 15% of 240?
- 30
- 36 (Correct answer)
- 40
- 48
Correct answer: 36
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?
- 1/5
- 1/3
- 1/2 (Correct answer)
- 5/10
Correct answer: 1/2
There are 5 blue marbles out of 10 total, so probability = 5/10 = 1/2.
Question 4: Evaluate: 48 ÷ (6 − 2) × 3
- 6
- 24
- 36 (Correct answer)
- 72
Correct answer: 36
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?
- 9 cm
- 11 cm (Correct answer)
- 19 cm
- 22 cm
Correct answer: 11 cm
Perimeter = 2(l + w), so 54 = 2(16 + w), giving w = 11 cm.
Question 6: Convert 0.045 to a fraction in simplest form.
- 45/100
- 9/200 (Correct answer)
- 9/20
- 45/1000
Correct answer: 9/200
0.045 = 45/1000, which simplifies to 9/200 by dividing both by 5.
Question 7: Train A leaves at 8:00 AM traveling 60 mph. Train B leaves at 9:00 AM on the same route at 75 mph. At what time does Train B catch Train A?
- 1:00 PM (Correct answer)
- 2:00 PM
- 3:00 PM
- 4:00 PM
Correct answer: 1:00 PM
Train A has a 60-mile head start; Train B gains 15 mph, so catches up in 60/15 = 4 hours after 9:00 AM = 1:00 PM.
CBEST Math: Computation and Problem-Solving 3
The ratio of boys to girls in a class is 3:4.
If there are 28 students total, how many are boys?