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

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

A. 6:5:10

B. 14:10:18

C. 7:5:9

D. 7:6:9

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 12:9 and their sum is 602. Find the numbers.

A. 365 and 225

B. 336 and 252

C. 672 and 504

D. 328 and 270

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Correct Answer: Option B

Explanation:
Numbers = 12k and 9k. 12k + 9k = 602 ⇒ k = 28. Thus, numbers are 336 and 252.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 7:5. After 11 years, the ratio becomes 8:7. Present age of A is?

A. 110 years

B. 102 years

C. 210 years

D. 105 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 5k. Then (7k + 11)/(5k + 11) = 8/7. Solving gives k ≈ 15, age of A = 7*15 = 105.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 6:5 and b:c = 5:11, then a:b:c = ?

A. 6:6:11

B. 12:10:22

C. 5:5:12

D. 6:5:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:11 ⇒ a:b:c = 6:5:11.

This question belongs to: Maths Ratio and Proportion

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