Find the mean proportional between 4 and 32. MCQ with Answer and Explanation

Find the mean proportional between 4 and 32.

A. 36

B. 11

C. 14

D. 22

Answer: Option B

Mean proportional = √(4 × 32) = √(128) = 11.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 7:5. Their difference is 102. What is their sum?

A. 647

B. 504

C. 546

D. 252

Correct Answer: Option B

Explanation:
Numbers 7k, 5k. Difference |7-5|k = 102 ⇒ k = 51. Sum = (7+5)k ≈ 504.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 6:10 and b:c = 10:4, then a:b:c = ?

A. 5:10:5

B. 6:11:4

C. 6:10:4

D. 12:20:8

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 6:10, b:c = 10:4 ⇒ a:b:c = 6:10:4.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 7:8 and b:c = 8:7, then a:b:c = ?

A. 6:8:8

B. 7:9:7

C. 14:16:14

D. 7:8:7

Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:8, b:c = 8:7 ⇒ a:b:c = 7:8:7.

This question belongs to: Maths Ratio and Proportion