If a:b = 6:10 and b:c = 10:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:10 and b:c = 10:6, then a:b:c = ?

A. 6:10:6

B. 5:10:7

C. 6:11:6

D. 12:20:12

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:10, b:c = 10:6 ⇒ a:b:c = 6:10:6.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 4:3 and b:c = 3:12, then a:b:c = ?

A. 8:6:24

B. 3:3:13

C. 4:4:12

D. 4:3:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:3, b:c = 3:12 ⇒ a:b:c = 4:3:12.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 2:5 and b:c = 5:10, then a:b:c = ?

A. 2:5:10

B. 4:10:20

C. 2:6:10

D. 1:5:11

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:5, b:c = 5:10 ⇒ a:b:c = 2:5:10.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:5. After 11 years, the ratio becomes 8:7. Present age of A is?

A. 210 years

B. 105 years

C. 102 years

D. 110 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 5k. Then (7k + 11)/(5k + 11) = 8/7. Solving gives k ≈ 15, age of A = 7*15 = 105.

This question belongs to: Maths Ratio and Proportion

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