If a:b = 3:7 and b:c = 7:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:7 and b:c = 7:9, then a:b:c = ?

A. 3:7:9

B. 6:14:18

C. 3:8:9

D. 2:7:10

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:7, b:c = 7:9 ⇒ a:b:c = 3:7:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 4:7:6

B. 8:12:12

C. 3:6:7

D. 4:6:6

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 8:10 and b:c = 10:6, then a:b:c = ?

A. 16:20:12

B. 8:11:6

C. 7:10:7

D. 8:10:6

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 8:10, b:c = 10:6 ⇒ a:b:c = 8:10:6.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 4:6. After 10 years, the ratio becomes 7:8. Present age of A is?

A. 26 years

B. 64 years

C. 32 years

D. 37 years

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Correct Answer: Option C

Explanation:
Let ages 4k and 6k. Then (4k + 10)/(6k + 10) = 7/8. Solving gives k ≈ 8, age of A = 4*8 = 32.

This question belongs to: Maths Ratio and Proportion

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