Find the mean proportional between 25 and 32. MCQ with Answer and Explanation

Find the mean proportional between 25 and 32.

A. 28

B. 31

C. 56

D. 57

Answer: Option A

Mean proportional = √(25 × 32) = √(800) = 28.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 4:12. Their difference is 122. What is their sum?

A. 104

B. 338

C. 208

D. 244

Correct Answer: Option C

Explanation:
Numbers 4k, 12k. Difference |4-12|k = 122 ⇒ k = 15. Sum = (4+12)k ≈ 208.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 6:9 and b:c = 9:8, then a:b:c = ?

A. 6:9:8

B. 5:9:9

C. 12:18:16

D. 6:10:8

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:8 ⇒ a:b:c = 6:9:8.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 3:9 and b:c = 9:7, then a:b:c = ?

A. 6:18:14

B. 3:10:7

C. 3:9:7

D. 2:9:8

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:9, b:c = 9:7 ⇒ a:b:c = 3:9:7.

This question belongs to: Maths Ratio and Proportion