Find the mean proportional between 20 and 62. MCQ with Answer and Explanation

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Find the mean proportional between 20 and 62.

A. 70

B. 35

C. 38

D. 82

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(20 × 62) = √(1240) = 35.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 9:5. Their difference is 112. What is their sum?

A. 420

B. 210

C. 569

D. 448

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Correct Answer: Option A

Explanation:
Numbers 9k, 5k. Difference |9-5|k = 112 ⇒ k = 28. Sum = (9+5)k ≈ 420.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 3:8. After 12 years, the ratio becomes 4:11. Present age of A is?

A. 74 years

B. 138 years

C. 65 years

D. 69 years

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Correct Answer: Option D

Explanation:
Let ages 3k and 8k. Then (3k + 12)/(8k + 12) = 4/11. Solving gives k ≈ 23, age of A = 3*23 = 69.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 3:10 and b:c = 10:4, then a:b:c = ?

A. 3:11:4

B. 6:20:8

C. 3:10:4

D. 2:10:5

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:10, b:c = 10:4 ⇒ a:b:c = 3:10:4.

This question belongs to: Maths Ratio and Proportion

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