If a:b = 7:9 and b:c = 9:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:9 and b:c = 9:5, then a:b:c = ?

A. 7:10:5

B. 7:9:5

C. 14:18:10

D. 6:9:6

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:9, b:c = 9:5 ⇒ a:b:c = 7:9:5.

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 9 years, the ratio becomes 6:10. Present age of A is?

A. 45 years

B. 50 years

C. 90 years

D. 40 years

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Correct Answer: Option A

Explanation:
Let ages 5k and 7k. Then (5k + 9)/(7k + 9) = 6/10. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

Question #2

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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. 95 years

B. 85 years

C. 180 years

D. 90 years

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Correct Answer: Option D

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

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Ratio of present ages of A and B is 5:5. After 5 years, the ratio becomes 6:7. Present age of A is?

A. 45 years

B. 39 years

C. 90 years

D. 50 years

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Let ages 5k and 5k. Then (5k + 5)/(5k + 5) = 6/7. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

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