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

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

A. 5:9:5

B. 5:8:5

C. 4:8:6

D. 10:16:10

Answer: Option B

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 14:12:14

B. 7:7:7

C. 7:6:7

D. 6:6:8

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Correct Answer: Option C

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

Question #2

If a:b = 7:6 and b:c = 6:4, then a:b:c = ?

A. 7:6:4

B. 6:6:5

C. 7:7:4

D. 14:12:8

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:6, b:c = 6:4 ⇒ a:b:c = 7:6:4.

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. 44 years

B. 51 years

C. 56 years

D. 102 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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