If a:b = 2:4 and b:c = 4:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:4 and b:c = 4:10, then a:b:c = ?

A. 1:4:11

B. 4:8:20

C. 2:5:10

D. 2:4:10

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:4, b:c = 4:10 ⇒ a:b:c = 2:4:10.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 5:5:7

B. 6:5:6

C. 12:10:12

D. 6:6:6

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Correct Answer: Option B

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

Question #2

Ratio of present ages of A and B is 6:5. After 5 years, the ratio becomes 9:6. Present age of A is?

A. 90 years

B. 95 years

C. 180 years

D. 85 years

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Correct Answer: Option A

Explanation:
Let ages 6k and 5k. Then (6k + 5)/(5k + 5) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 7:6 and b:c = 6:5, then a:b:c = ?

A. 7:7:5

B. 14:12:10

C. 6:6:6

D. 7:6:5

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:6, b:c = 6:5 ⇒ a:b:c = 7:6:5.

This question belongs to: Maths Ratio and Proportion

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