Find the mean proportional between 31 and 33. MCQ with Answer and Explanation

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Find the mean proportional between 31 and 33.

A. 64

B. 62

C. 34

D. 31

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(31 × 33) = √(1023) = 31.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 547

B. 418

C. 471

D. 209

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?

A. 123 years

B. 131 years

C. 252 years

D. 126 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:3 and b:c = 3:5, then a:b:c = ?

A. 5:4:5

B. 5:3:5

C. 4:3:6

D. 10:6:10

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:3, b:c = 3:5 ⇒ a:b:c = 5:3:5.

This question belongs to: Maths Ratio and Proportion

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