Find the mean proportional between 36 and 21. MCQ with Answer and Explanation

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Find the mean proportional between 36 and 21.

A. 27

B. 54

C. 30

D. 57

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(36 × 21) = √(756) = 27.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 14:12 and their sum is 772. Find the numbers.

A. 421 and 329

B. 812 and 696

C. 389 and 367

D. 406 and 348

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Correct Answer: Option D

Explanation:
Numbers = 14k and 12k. 14k + 12k = 772 ⇒ k = 29. Thus, numbers are 406 and 348.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in ratio 6:12. Their difference is 91. What is their sum?

A. 533

B. 396

C. 449

D. 198

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Correct Answer: Option B

Explanation:
Numbers 6k, 12k. Difference |6-12|k = 91 ⇒ k = 15. Sum = (6+12)k ≈ 396.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 7:10 and b:c = 10:11, then a:b:c = ?

A. 7:10:11

B. 7:11:11

C. 14:20:22

D. 6:10:12

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:11 ⇒ a:b:c = 7:10:11.

This question belongs to: Maths Ratio and Proportion

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