Find the mean proportional between 20 and 36. MCQ with Answer and Explanation

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Find the mean proportional between 20 and 36.

A. 56

B. 26

C. 29

D. 52

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(20 × 36) = √(720) = 26.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 6:8:8

B. 7:8:7

C. 14:16:14

D. 7:9:7

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Correct Answer: Option B

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

Question #2

Two numbers are in ratio 11:6. Their difference is 58. What is their sum?

A. 391

B. 136

C. 272

D. 310

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Correct Answer: Option C

Explanation:
Numbers 11k, 6k. Difference |11-6|k = 58 ⇒ k = 11. Sum = (11+6)k ≈ 272.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 6:4. After 9 years, the ratio becomes 9:6. Present age of A is?

A. 83 years

B. 180 years

C. 90 years

D. 95 years

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Correct Answer: Option C

Explanation:
Let ages 6k and 4k. Then (6k + 9)/(4k + 9) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

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