Find the mean proportional between 20 and 74. MCQ with Answer and Explanation

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Find the mean proportional between 20 and 74.

A. 94

B. 38

C. 41

D. 76

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(20 × 74) = √(1480) = 38.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 6:9 and b:c = 9:10, then a:b:c = ?

A. 12:18:20

B. 6:9:10

C. 5:9:11

D. 6:10:10

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:10 ⇒ a:b:c = 6:9:10.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 11:8. Their difference is 86. What is their sum?

A. 152

B. 304

C. 333

D. 430

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Correct Answer: Option B

Explanation:
Numbers 11k, 8k. Difference |11-8|k = 86 ⇒ k = 28. Sum = (11+8)k ≈ 304.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 3:6. After 8 years, the ratio becomes 5:8. Present age of A is?

A. 74 years

B. 66 years

C. 138 years

D. 69 years

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Correct Answer: Option D

Explanation:
Let ages 3k and 6k. Then (3k + 8)/(6k + 8) = 5/8. Solving gives k ≈ 23, age of A = 3*23 = 69.

This question belongs to: Maths Ratio and Proportion

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