If a:b = 3:3 and b:c = 3:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:3 and b:c = 3:7, then a:b:c = ?

A. 2:3:8

B. 6:6:14

C. 3:4:7

D. 3:3:7

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:3, b:c = 3:7 ⇒ a:b:c = 3:3:7.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 12:10. Their difference is 74. What is their sum?

A. 264

B. 132

C. 387

D. 312

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Correct Answer: Option A

Explanation:
Numbers 12k, 10k. Difference |12-10|k = 74 ⇒ k = 37. Sum = (12+10)k ≈ 264.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 168 years

B. 89 years

C. 81 years

D. 84 years

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Correct Answer: Option D

Explanation:
Let ages 4k and 4k. Then (4k + 6)/(4k + 6) = 5/5. Solving gives k ≈ 21, age of A = 4*21 = 84.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:8 and b:c = 8:12, then a:b:c = ?

A. 4:16:24

B. 1:8:13

C. 2:9:12

D. 2:8:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:12 ⇒ a:b:c = 2:8:12.

This question belongs to: Maths Ratio and Proportion

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