Find the mean proportional between 11 and 38. MCQ with Answer and Explanation

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Find the mean proportional between 11 and 38.

A. 49

B. 20

C. 40

D. 23

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(11 × 38) = √(418) = 20.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 8:6 and their sum is 434. Find the numbers.

A. 262 and 167

B. 248 and 186

C. 496 and 372

D. 230 and 206

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Correct Answer: Option B

Explanation:
Numbers = 8k and 6k. 8k + 6k = 434 ⇒ k = 31. Thus, numbers are 248 and 186.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:10 and b:c = 10:12, then a:b:c = ?

A. 1:10:13

B. 2:11:12

C. 4:20:24

D. 2:10:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:10, b:c = 10:12 ⇒ a:b:c = 2:10:12.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 4:5:6

B. 8:8:12

C. 3:4:7

D. 4:4:6

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

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