Find the mean proportional between 23 and 54. MCQ with Answer and Explanation

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Find the mean proportional between 23 and 54.

A. 38

B. 70

C. 35

D. 77

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean proportional = √(23 × 54) = √(1242) = 35.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 430

B. 304

C. 152

D. 333

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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 #2

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If a:b = 4:3 and b:c = 3:6, then a:b:c = ?

A. 8:6:12

B. 3:3:7

C. 4:4:6

D. 4:3:6

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:3, b:c = 3:6 ⇒ a:b:c = 4:3:6.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 15:9 and their sum is 542. Find the numbers.

A. 342 and 171

B. 320 and 205

C. 660 and 396

D. 330 and 198

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Correct Answer: Option D

Explanation:
Numbers = 15k and 9k. 15k + 9k = 542 ⇒ k = 22. Thus, numbers are 330 and 198.

This question belongs to: Maths Ratio and Proportion

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