Find the mean proportional between 22 and 51. MCQ with Answer and Explanation

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Find the mean proportional between 22 and 51.

A. 66

B. 36

C. 33

D. 73

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean proportional = √(22 × 51) = √(1122) = 33.

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 4:8. After 6 years, the ratio becomes 7:11. Present age of A is?

A. 97 years

B. 87 years

C. 92 years

D. 184 years

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Correct Answer: Option C

Explanation:
Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 7/11. Solving gives k ≈ 23, age of A = 4*23 = 92.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:6 and b:c = 6:9, then a:b:c = ?

A. 4:12:18

B. 1:6:10

C. 2:6:9

D. 2:7:9

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:6, b:c = 6:9 ⇒ a:b:c = 2:6:9.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in ratio 7:4. Their difference is 53. What is their sum?

A. 547

B. 471

C. 418

D. 209

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Correct Answer: Option C

Explanation:
Numbers 7k, 4k. Difference |7-4|k = 53 ⇒ k = 17. Sum = (7+4)k ≈ 418.

This question belongs to: Maths Ratio and Proportion

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