Find the mean proportional between 19 and 78. MCQ with Answer and Explanation

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Find the mean proportional between 19 and 78.

A. 97

B. 38

C. 41

D. 76

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(19 × 78) = √(1482) = 38.

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 11 years, the ratio becomes 8:9. Present age of A is?

A. 252 years

B. 131 years

C. 119 years

D. 126 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 5:8 and b:c = 8:12, then a:b:c = ?

A. 5:8:12

B. 5:9:12

C. 10:16:24

D. 4:8:13

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:3 and b:c = 3:9, then a:b:c = ?

A. 1:3:10

B. 2:3:9

C. 4:6:18

D. 2:4:9

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:3, b:c = 3:9 ⇒ a:b:c = 2:3:9.

This question belongs to: Maths Ratio and Proportion

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