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

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

A. 2:3:13

B. 3:4:12

C. 6:6:24

D. 3:3:12

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 8:10 and b:c = 10:12, then a:b:c = ?

A. 16:20:24

B. 7:10:13

C. 8:10:12

D. 8:11:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 8:10, b:c = 10:12 ⇒ a:b:c = 8:10:12.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:8. After 12 years, the ratio becomes 8:9. Present age of A is?

A. 154 years

B. 70 years

C. 82 years

D. 77 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 8k. Then (7k + 12)/(8k + 12) = 8/9. Solving gives k ≈ 11, age of A = 7*11 = 77.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 3:4 and b:c = 4:6, then a:b:c = ?

A. 6:8:12

B. 3:4:6

C. 2:4:7

D. 3:5:6

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:4, b:c = 4:6 ⇒ a:b:c = 3:4:6.

This question belongs to: Maths Ratio and Proportion

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