If a:b = 8:10 and b:c = 10:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:10 and b:c = 10:10, then a:b:c = ?

A. 8:11:10

B. 7:10:11

C. 8:10:10

D. 16:20:20

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:10, b:c = 10:10 ⇒ a:b:c = 8:10:10.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 7:10 and b:c = 10:9, then a:b:c = ?

A. 7:11:9

B. 6:10:10

C. 7:10:9

D. 14:20:18

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:9 ⇒ a:b:c = 7:10:9.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 5:7. After 9 years, the ratio becomes 6:10. Present age of A is?

A. 40 years

B. 90 years

C. 45 years

D. 50 years

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Correct Answer: Option C

Explanation:
Let ages 5k and 7k. Then (5k + 9)/(7k + 9) = 6/10. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 8:3 and b:c = 3:8, then a:b:c = ?

A. 8:4:8

B. 8:3:8

C. 16:6:16

D. 7:3:9

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:3, b:c = 3:8 ⇒ a:b:c = 8:3:8.

This question belongs to: Maths Ratio and Proportion

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