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. 7:4:12

B. 8:4:11

C. 16:8:22

D. 8:5:11

Answer: Option B

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

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Ratio of present ages of A and B is 3:7. After 5 years, the ratio becomes 5:10. Present age of A is?

A. 144 years

B. 72 years

C. 65 years

D. 77 years

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Correct Answer: Option B

Explanation:
Let ages 3k and 7k. Then (3k + 5)/(7k + 5) = 5/10. Solving gives k ≈ 24, age of A = 3*24 = 72.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 4:10 and b:c = 10:10, then a:b:c = ?

A. 8:20:20

B. 3:10:11

C. 4:11:10

D. 4:10:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:10, b:c = 10:10 ⇒ a:b:c = 4:10:10.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 6:5 and b:c = 5:6, then a:b:c = ?

A. 12:10:12

B. 6:6:6

C. 6:5:6

D. 5:5:7

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:6 ⇒ a:b:c = 6:5:6.

This question belongs to: Maths Ratio and Proportion

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