If a:b = 2:8 and b:c = 8:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:8 and b:c = 8:12, then a:b:c = ?

A. 1:8:13

B. 2:9:12

C. 2:8:12

D. 4:16:24

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:8, b:c = 8:12 ⇒ a:b:c = 2:8:12.

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 6:6. After 12 years, the ratio becomes 8:7. Present age of A is?

A. 144 years

B. 64 years

C. 72 years

D. 77 years

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Correct Answer: Option C

Explanation:
Let ages 6k and 6k. Then (6k + 12)/(6k + 12) = 8/7. Solving gives k ≈ 12, age of A = 6*12 = 72.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 3:5. After 5 years, the ratio becomes 5:6. Present age of A is?

A. 42 years

B. 36 years

C. 84 years

D. 47 years

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Correct Answer: Option A

Explanation:
Let ages 3k and 5k. Then (3k + 5)/(5k + 5) = 5/6. Solving gives k ≈ 14, age of A = 3*14 = 42.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 3:6 and b:c = 6:12, then a:b:c = ?

A. 6:12:24

B. 2:6:13

C. 3:6:12

D. 3:7:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:12 ⇒ a:b:c = 3:6:12.

This question belongs to: Maths Ratio and Proportion

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