If a:b = 4:9 and b:c = 9:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:9 and b:c = 9:11, then a:b:c = ?

A. 3:9:12

B. 8:18:22

C. 4:10:11

D. 4:9:11

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:9, b:c = 9:11 ⇒ a:b:c = 4:9:11.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 28 and 49.

A. 77

B. 37

C. 74

D. 40

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Correct Answer: Option B

Explanation:
Mean proportional = √(28 × 49) = √(1372) = 37.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 5:4 in a 536 L mixture. Quantity of milk?

A. 329 L

B. 594 L

C. 239 L

D. 297 L

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Correct Answer: Option D

Explanation:
Total parts = 9. Milk = [5 / (5+4)] × 536 = 297 L.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:5. After 10 years, the ratio becomes 8:8. Present age of A is?

A. 127 years

B. 138 years

C. 266 years

D. 133 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 5k. Then (7k + 10)/(5k + 10) = 8/8. Solving gives k ≈ 19, age of A = 7*19 = 133.

This question belongs to: Maths Ratio and Proportion

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