If a:b = 8:4 and b:c = 4:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:4 and b:c = 4:11, then a:b:c = ?

A. 8:5:11

B. 7:4:12

C. 8:4:11

D. 16:8:22

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:4, b:c = 4:11 ⇒ a:b:c = 8:4:11.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 5:8 and b:c = 8:7, then a:b:c = ?

A. 10:16:14

B. 5:9:7

C. 4:8:8

D. 5:8:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:7 ⇒ a:b:c = 5:8:7.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 6:9 and b:c = 9:11, then a:b:c = ?

A. 5:9:12

B. 12:18:22

C. 6:9:11

D. 6:10:11

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:11 ⇒ a:b:c = 6:9:11.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:4. After 9 years, the ratio becomes 10:5. Present age of A is?

A. 168 years

B. 173 years

C. 336 years

D. 161 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 4k. Then (7k + 9)/(4k + 9) = 10/5. Solving gives k ≈ 24, age of A = 7*24 = 168.

This question belongs to: Maths Ratio and Proportion

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