If a:b = 5:4 and b:c = 4:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:4 and b:c = 4:6, then a:b:c = ?

A. 5:5:6

B. 10:8:12

C. 5:4:6

D. 4:4:7

Answer: Option C

Solution (By JKExamLibrary)

Combine ratios: a:b = 5:4, b:c = 4:6 ⇒ a:b:c = 5:4:6.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1 Report Error

If a:b = 2:4 and b:c = 4:7, then a:b:c = ?

A. 2:5:7

B. 1:4:8

C. 2:4:7

D. 4:8:14

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:7 ⇒ a:b:c = 2:4:7.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 2:10 and b:c = 10:12, then a:b:c = ?

A. 2:11:12

B. 1:10:13

C. 2:10:12

D. 4:20:24

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:10, b:c = 10:12 ⇒ a:b:c = 2:10:12.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

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. 82 years

C. 77 years

D. 70 years

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Correct Answer: Option C

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

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