If a:b = 5:5 and b:c = 5:6, then a:b:c = ? MCQ with Answer and Explanation

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

A. 4:5:7

B. 10:10:12

C. 5:6:6

D. 5:5:6

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 4:9 and b:c = 9:11, then a:b:c = ?

A. 3:9:12

B. 4:9:11

C. 4:10:11

D. 8:18:22

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 4:9, b:c = 9:11 ⇒ a:b:c = 4:9:11.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is?

A. 112 years

B. 61 years

C. 52 years

D. 56 years

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Correct Answer: Option D

Explanation:
Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 5/10. Solving gives k ≈ 14, age of A = 4*14 = 56.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 7:10 and b:c = 10:11, then a:b:c = ?

A. 14:20:22

B. 7:10:11

C. 6:10:12

D. 7:11:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:11 ⇒ a:b:c = 7:10:11.

This question belongs to: Maths Ratio and Proportion

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