If a:b = 4:3 and b:c = 3:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:3 and b:c = 3:12, then a:b:c = ?

A. 8:6:24

B. 3:3:13

C. 4:3:12

D. 4:4:12

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:3, b:c = 3:12 ⇒ a:b:c = 4:3:12.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 4:5. After 4 years, the ratio becomes 6:7. Present age of A is?

A. 120 years

B. 65 years

C. 55 years

D. 60 years

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Correct Answer: Option D

Explanation:
Let ages 4k and 5k. Then (4k + 4)/(5k + 4) = 6/7. Solving gives k ≈ 15, age of A = 4*15 = 60.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 6:5 and b:c = 5:11, then a:b:c = ?

A. 5:5:12

B. 6:5:11

C. 12:10:22

D. 6:6:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:11 ⇒ a:b:c = 6:5:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 3:9 and b:c = 9:7, then a:b:c = ?

A. 6:18:14

B. 3:10:7

C. 3:9:7

D. 2:9:8

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:9, b:c = 9:7 ⇒ a:b:c = 3:9:7.

This question belongs to: Maths Ratio and Proportion

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