If a:b = 2:7 and b:c = 7:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:7 and b:c = 7:9, then a:b:c = ?

A. 1:7:10

B. 2:8:9

C. 4:14:18

D. 2:7:9

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:7, b:c = 7:9 ⇒ a:b:c = 2:7:9.

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 5:7. After 6 years, the ratio becomes 6:10. Present age of A is?

A. 250 years

B. 121 years

C. 125 years

D. 130 years

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Correct Answer: Option C

Explanation:
Let ages 5k and 7k. Then (5k + 6)/(7k + 6) = 6/10. Solving gives k ≈ 25, age of A = 5*25 = 125.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 5:10:10

B. 10:20:20

C. 5:11:10

D. 4:10:11

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 7:6:7

B. 14:12:14

C. 6:6:8

D. 7:7:7

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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