Find the mean proportional between 25 and 32. MCQ with Answer and Explanation

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Find the mean proportional between 25 and 32.

A. 28

B. 31

C. 56

D. 57

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(25 × 32) = √(800) = 28.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 8:8:12

B. 4:4:6

C. 3:4:7

D. 4:5:6

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 5:5. After 5 years, the ratio becomes 6:7. Present age of A is?

A. 45 years

B. 50 years

C. 39 years

D. 90 years

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Correct Answer: Option A

Explanation:
Let ages 5k and 5k. Then (5k + 5)/(5k + 5) = 6/7. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:10 and b:c = 10:12, then a:b:c = ?

A. 2:10:12

B. 1:10:13

C. 2:11:12

D. 4:20:24

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:10, b:c = 10:12 ⇒ a:b:c = 2:10:12.

This question belongs to: Maths Ratio and Proportion

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