Find the mean proportional between 16 and 39. MCQ with Answer and Explanation

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Find the mean proportional between 16 and 39.

A. 55

B. 48

C. 27

D. 24

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(16 × 39) = √(624) = 24.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is?

A. 145 years

B. 140 years

C. 135 years

D. 280 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 8k. Then (7k + 8)/(8k + 8) = 9/9. Solving gives k ≈ 20, age of A = 7*20 = 140.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 5:7 and b:c = 7:5, then a:b:c = ?

A. 5:8:5

B. 10:14:10

C. 4:7:6

D. 5:7:5

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:7, b:c = 7:5 ⇒ a:b:c = 5:7:5.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 4:7 and b:c = 7:10, then a:b:c = ?

A. 4:7:10

B. 8:14:20

C. 3:7:11

D. 4:8:10

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 4:7, b:c = 7:10 ⇒ a:b:c = 4:7:10.

This question belongs to: Maths Ratio and Proportion

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