If a:b = 2:3 and b:c = 3:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:3 and b:c = 3:9, then a:b:c = ?

A. 4:6:18

B. 2:4:9

C. 1:3:10

D. 2:3:9

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:3, b:c = 3:9 ⇒ a:b:c = 2:3:9.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 1:7:13

B. 4:14:24

C. 2:7:12

D. 2:8:12

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 11:6. Their difference is 42. What is their sum?

A. 263

B. 560

C. 527

D. 633

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Correct Answer: Option C

Explanation:
Numbers 11k, 6k. Difference |11-6|k = 42 ⇒ k = 8. Sum = (11+6)k ≈ 527.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:5. After 12 years, the ratio becomes 8:8. Present age of A is?

A. 196 years

B. 103 years

C. 98 years

D. 94 years

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Correct Answer: Option C

Explanation:
Let ages 7k and 5k. Then (7k + 12)/(5k + 12) = 8/8. Solving gives k ≈ 14, age of A = 7*14 = 98.

This question belongs to: Maths Ratio and Proportion

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