Find the mean proportional between 30 and 36. MCQ with Answer and Explanation

Find the mean proportional between 30 and 36.

A. 32

B. 64

C. 35

D. 66

Answer: Option A

Mean proportional = √(30 × 36) = √(1080) = 32.

This question belongs to: Maths Ratio and Proportion

No comments yet. Be the first to start the discussion!

Question #1 Report Error

Two numbers are in ratio 9:7. Their difference is 150. What is their sum?

A. 423

B. 288

C. 326

D. 144

Correct Answer: Option B

Explanation:
Numbers 9k, 7k. Difference |9-7|k = 150 ⇒ k = 75. Sum = (9+7)k ≈ 288.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 7:5 and b:c = 5:5, then a:b:c = ?

A. 7:5:5

B. 14:10:10

C. 6:5:6

D. 7:6:5

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:5, b:c = 5:5 ⇒ a:b:c = 7:5:5.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Two numbers are in the ratio 15:12 and their sum is 319. Find the numbers.

A. 165 and 132

B. 147 and 149

C. 184 and 102

D. 330 and 264

Correct Answer: Option A

Explanation:
Numbers = 15k and 12k. 15k + 12k = 319 ⇒ k = 11. Thus, numbers are 165 and 132.

This question belongs to: Maths Ratio and Proportion