Find the mean proportional between 24 and 31. MCQ with Answer and Explanation

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Find the mean proportional between 24 and 31.

A. 30

B. 55

C. 27

D. 54

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean proportional = √(24 × 31) = √(744) = 27.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 9:7 in a 533 L mixture. Quantity of milk?

A. 598 L

B. 336 L

C. 234 L

D. 299 L

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Correct Answer: Option D

Explanation:
Total parts = 16. Milk = [9 / (9+7)] × 533 = 299 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 7:8. After 12 years, the ratio becomes 8:9. Present age of A is?

A. 77 years

B. 82 years

C. 154 years

D. 70 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 12)/(8k + 12) = 8/9. Solving gives k ≈ 11, age of A = 7*11 = 77.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 6:5 in a 226 L mixture. Quantity of milk?

A. 246 L

B. 153 L

C. 123 L

D. 103 L

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Correct Answer: Option C

Explanation:
Total parts = 11. Milk = [6 / (6+5)] × 226 = 123 L.

This question belongs to: Maths Ratio and Proportion

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