If a:b = 2:7 and b:c = 7:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:7 and b:c = 7:12, then a:b:c = ?

A. 2:8:12

B. 2:7:12

C. 1:7:13

D. 4:14:24

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:7, b:c = 7:12 ⇒ a:b:c = 2:7:12.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 23 and 54.

A. 38

B. 35

C. 77

D. 70

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Correct Answer: Option B

Explanation:
Mean proportional = √(23 × 54) = √(1242) = 35.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 13:10 and their sum is 746. Find the numbers.

A. 403 and 338

B. 416 and 320

C. 434 and 298

D. 832 and 640

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Correct Answer: Option B

Explanation:
Numbers = 13k and 10k. 13k + 10k = 746 ⇒ k = 32. Thus, numbers are 416 and 320.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 3:4 and b:c = 4:11, then a:b:c = ?

A. 2:4:12

B. 6:8:22

C. 3:5:11

D. 3:4:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:4, b:c = 4:11 ⇒ a:b:c = 3:4:11.

This question belongs to: Maths Ratio and Proportion

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