If a:b = 7:4 and b:c = 4:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:4 and b:c = 4:8, then a:b:c = ?

A. 7:5:8

B. 7:4:8

C. 6:4:9

D. 14:8:16

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:4, b:c = 4:8 ⇒ a:b:c = 7:4:8.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 3:6 and b:c = 6:9, then a:b:c = ?

A. 3:6:9

B. 6:12:18

C. 2:6:10

D. 3:7:9

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:9 ⇒ a:b:c = 3:6:9.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is?

A. 135 years

B. 145 years

C. 280 years

D. 140 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 8k. Then (7k + 8)/(8k + 8) = 9/9. Solving gives k ≈ 20, age of A = 7*20 = 140.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:8 and b:c = 8:11, then a:b:c = ?

A. 4:16:22

B. 2:9:11

C. 1:8:12

D. 2:8:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:11 ⇒ a:b:c = 2:8:11.

This question belongs to: Maths Ratio and Proportion

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