If a:b = 2:6 and b:c = 6:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:6 and b:c = 6:11, then a:b:c = ?

A. 2:7:11

B. 4:12:22

C. 1:6:12

D. 2:6:11

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:6, b:c = 6:11 ⇒ a:b:c = 2:6:11.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is?

A. 145 years

B. 135 years

C. 140 years

D. 280 years

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Correct Answer: Option C

Explanation:
Let ages 7k and 8k. Then (7k + 8)/(8k + 8) = 9/9. Solving gives k ≈ 20, age of A = 7*20 = 140.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in the ratio 10:13 and their sum is 790. Find the numbers.

A. 340 and 442

B. 332 and 454

C. 680 and 884

D. 353 and 416

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Correct Answer: Option A

Explanation:
Numbers = 10k and 13k. 10k + 13k = 790 ⇒ k = 34. Thus, numbers are 340 and 442.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 11:15 and their sum is 450. Find the numbers.

A. 187 and 255

B. 374 and 510

C. 214 and 229

D. 181 and 267

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Correct Answer: Option A

Explanation:
Numbers = 11k and 15k. 11k + 15k = 450 ⇒ k = 17. Thus, numbers are 187 and 255.

This question belongs to: Maths Ratio and Proportion

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