If a:b = 8:5 and b:c = 5:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:5 and b:c = 5:9, then a:b:c = ?

A. 8:6:9

B. 8:5:9

C. 16:10:18

D. 7:5:10

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:5, b:c = 5:9 ⇒ a:b:c = 8:5:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 5:10:7

B. 10:18:14

C. 5:9:7

D. 4:9:8

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 7:4 and b:c = 4:10, then a:b:c = ?

A. 7:5:10

B. 14:8:20

C. 7:4:10

D. 6:4:11

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 7:4, b:c = 4:10 ⇒ a:b:c = 7:4:10.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 3:8. After 10 years, the ratio becomes 4:10. Present age of A is?

A. 102 years

B. 51 years

C. 44 years

D. 56 years

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Correct Answer: Option B

Explanation:
Let ages 3k and 8k. Then (3k + 10)/(8k + 10) = 4/10. Solving gives k ≈ 17, age of A = 3*17 = 51.

This question belongs to: Maths Ratio and Proportion

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