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. 38

B. 94

C. 41

D. 76

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 5:3 and their sum is 590. Find the numbers.

A. 730 and 438

B. 389 and 195

C. 348 and 236

D. 365 and 219

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Correct Answer: Option D

Explanation:
Numbers = 5k and 3k. 5k + 3k = 590 ⇒ k = 73. Thus, numbers are 365 and 219.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 3:3 and b:c = 3:12, then a:b:c = ?

A. 3:4:12

B. 2:3:13

C. 6:6:24

D. 3:3:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:3, b:c = 3:12 ⇒ a:b:c = 3:3:12.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:5 and b:c = 5:8, then a:b:c = ?

A. 10:10:16

B. 5:5:8

C. 4:5:9

D. 5:6:8

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:5, b:c = 5:8 ⇒ a:b:c = 5:5:8.

This question belongs to: Maths Ratio and Proportion

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