Find the mean proportional between 24 and 76. MCQ with Answer and Explanation

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Find the mean proportional between 24 and 76.

A. 100

B. 84

C. 45

D. 42

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(24 × 76) = √(1824) = 42.

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 5:5. After 7 years, the ratio becomes 6:7. Present age of A is?

A. 110 years

B. 50 years

C. 60 years

D. 55 years

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Correct Answer: Option D

Explanation:
Let ages 5k and 5k. Then (5k + 7)/(5k + 7) = 6/7. Solving gives k ≈ 11, age of A = 5*11 = 55.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 4:9 and b:c = 9:11, then a:b:c = ?

A. 8:18:22

B. 3:9:12

C. 4:10:11

D. 4:9:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:9, b:c = 9:11 ⇒ a:b:c = 4:9:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 3:4:12

B. 3:3:12

C. 2:3:13

D. 6:6:24

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Correct Answer: Option B

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

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