If a:b = 5:7 and b:c = 7:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:7 and b:c = 7:7, then a:b:c = ?

A. 4:7:8

B. 10:14:14

C. 5:8:7

D. 5:7:7

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:7, b:c = 7:7 ⇒ a:b:c = 5:7:7.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 8:4 and b:c = 4:6, then a:b:c = ?

A. 16:8:12

B. 7:4:7

C. 8:5:6

D. 8:4:6

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 8:4, b:c = 4:6 ⇒ a:b:c = 8:4:6.

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 7:11. Present age of A is?

A. 97 years

B. 184 years

C. 87 years

D. 92 years

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Correct Answer: Option D

Explanation:
Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 7/11. Solving gives k ≈ 23, age of A = 4*23 = 92.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 7:12. Their difference is 120. What is their sum?

A. 658

B. 593

C. 275

D. 551

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Correct Answer: Option D

Explanation:
Numbers 7k, 12k. Difference |7-12|k = 120 ⇒ k = 24. Sum = (7+12)k ≈ 551.

This question belongs to: Maths Ratio and Proportion

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