Find the mean proportional between 28 and 14. MCQ with Answer and Explanation

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Find the mean proportional between 28 and 14.

A. 19

B. 22

C. 38

D. 42

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(28 × 14) = √(392) = 19.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 8:8 and b:c = 8:5, then a:b:c = ?

A. 8:9:5

B. 8:8:5

C. 7:8:6

D. 16:16:10

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:8, b:c = 8:5 ⇒ a:b:c = 8:8:5.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 5:7. After 6 years, the ratio becomes 6:10. Present age of A is?

A. 125 years

B. 250 years

C. 121 years

D. 130 years

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Correct Answer: Option A

Explanation:
Let ages 5k and 7k. Then (5k + 6)/(7k + 6) = 6/10. Solving gives k ≈ 25, age of A = 5*25 = 125.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 3:6 and b:c = 6:4, then a:b:c = ?

A. 6:12:8

B. 3:6:4

C. 2:6:5

D. 3:7:4

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:4 ⇒ a:b:c = 3:6:4.

This question belongs to: Maths Ratio and Proportion

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