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

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

A. 10:10:16

B. 5:5:8

C. 5:6:8

D. 4:5:9

Answer: Option B

Solution (By JKSSB Mock Tests)

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

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 4:5. After 5 years, the ratio becomes 5:8. Present age of A is?

A. 76 years

B. 81 years

C. 68 years

D. 152 years

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Correct Answer: Option A

Explanation:
Let ages 4k and 5k. Then (4k + 5)/(5k + 5) = 5/8. Solving gives k ≈ 19, age of A = 4*19 = 76.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 4:6 and b:c = 6:11, then a:b:c = ?

A. 4:7:11

B. 3:6:12

C. 4:6:11

D. 8:12:22

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:6, b:c = 6:11 ⇒ a:b:c = 4:6:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 12:14:8

B. 6:8:4

C. 6:7:4

D. 5:7:5

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

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