Find the mean proportional between 14 and 40. MCQ with Answer and Explanation

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Find the mean proportional between 14 and 40.

A. 46

B. 26

C. 54

D. 23

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(14 × 40) = √(560) = 23.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 7:11. Their difference is 125. What is their sum?

A. 306

B. 153

C. 389

D. 345

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Correct Answer: Option A

Explanation:
Numbers 7k, 11k. Difference |7-11|k = 125 ⇒ k = 31. Sum = (7+11)k ≈ 306.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:8 and b:c = 8:10, then a:b:c = ?

A. 1:8:11

B. 2:8:10

C. 2:9:10

D. 4:16:20

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:10 ⇒ a:b:c = 2:8:10.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 10:13 and their sum is 790. Find the numbers.

A. 353 and 416

B. 332 and 454

C. 340 and 442

D. 680 and 884

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Correct Answer: Option C

Explanation:
Numbers = 10k and 13k. 10k + 13k = 790 ⇒ k = 34. Thus, numbers are 340 and 442.

This question belongs to: Maths Ratio and Proportion

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