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. 52

C. 29

D. 26

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

Find the mean proportional between 30 and 36.

A. 32

B. 35

C. 64

D. 66

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Correct Answer: Option A

Explanation:
Mean proportional = √(30 × 36) = √(1080) = 32.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 6:5 and b:c = 5:11, then a:b:c = ?

A. 5:5:12

B. 12:10:22

C. 6:6:11

D. 6:5:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:11 ⇒ a:b:c = 6:5:11.

This question belongs to: Maths Ratio and Proportion

Question #3

Milk and water are in ratio 8:5 in a 369 L mixture. Quantity of milk?

A. 248 L

B. 227 L

C. 454 L

D. 142 L

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Correct Answer: Option B

Explanation:
Total parts = 13. Milk = [8 / (8+5)] × 369 = 227 L.

This question belongs to: Maths Ratio and Proportion

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