If a:b = 2:5 and b:c = 5:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:5 and b:c = 5:10, then a:b:c = ?

A. 2:5:10

B. 4:10:20

C. 1:5:11

D. 2:6:10

Answer: Option A

Solution (By JKExamLibrary)

Combine ratios: a:b = 2:5, b:c = 5:10 ⇒ a:b:c = 2:5:10.

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 = 2:7 and b:c = 7:6, then a:b:c = ?

A. 4:14:12

B. 1:7:7

C. 2:7:6

D. 2:8:6

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:7, b:c = 7:6 ⇒ a:b:c = 2:7:6.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 4:3 and b:c = 3:6, then a:b:c = ?

A. 8:6:12

B. 3:3:7

C. 4:4:6

D. 4:3:6

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:3, b:c = 3:6 ⇒ a:b:c = 4:3:6.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 6:4. After 9 years, the ratio becomes 9:6. Present age of A is?

A. 95 years

B. 180 years

C. 83 years

D. 90 years

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Correct Answer: Option D

Explanation:
Let ages 6k and 4k. Then (6k + 9)/(4k + 9) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

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