If a:b = 5:5 and b:c = 5:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:5 and b:c = 5:12, then a:b:c = ?

A. 5:6:12

B. 5:5:12

C. 4:5:13

D. 10:10:24

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:5, b:c = 5:12 ⇒ a:b:c = 5:5:12.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 2:3 and b:c = 3:9, then a:b:c = ?

A. 2:3:9

B. 2:4:9

C. 1:3:10

D. 4:6:18

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:3, b:c = 3:9 ⇒ a:b:c = 2:3:9.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 3:4 and b:c = 4:5, then a:b:c = ?

A. 2:4:6

B. 3:4:5

C. 6:8:10

D. 3:5:5

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:4, b:c = 4:5 ⇒ a:b:c = 3:4:5.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 5:4. After 12 years, the ratio becomes 8:5. Present age of A is?

A. 115 years

B. 111 years

C. 230 years

D. 120 years

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Correct Answer: Option A

Explanation:
Let ages 5k and 4k. Then (5k + 12)/(4k + 12) = 8/5. Solving gives k ≈ 23, age of A = 5*23 = 115.

This question belongs to: Maths Ratio and Proportion

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