Find the mean proportional between 18 and 55. MCQ with Answer and Explanation

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Find the mean proportional between 18 and 55.

A. 73

B. 34

C. 62

D. 31

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(18 × 55) = √(990) = 31.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 5:14 and their sum is 285. Find the numbers.

A. 150 and 420

B. 58 and 219

C. 96 and 184

D. 75 and 210

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Correct Answer: Option D

Explanation:
Numbers = 5k and 14k. 5k + 14k = 285 ⇒ k = 15. Thus, numbers are 75 and 210.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 8:2 in a 156 L mixture. Quantity of milk?

A. 172 L

B. 248 L

C. 124 L

D. 32 L

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Correct Answer: Option C

Explanation:
Total parts = 10. Milk = [8 / (8+2)] × 156 = 124 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 7:6 and b:c = 6:4, then a:b:c = ?

A. 14:12:8

B. 6:6:5

C. 7:7:4

D. 7:6:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:6, b:c = 6:4 ⇒ a:b:c = 7:6:4.

This question belongs to: Maths Ratio and Proportion

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