If a:b = 2:7 and b:c = 7:8, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 2:7 and b:c = 7:8, then a:b:c = ?

A. 4:14:16

B. 2:8:8

C. 2:7:8

D. 1:7:9

Answer: Option C

Combine ratios: a:b = 2:7, b:c = 7:8 ⇒ a:b:c = 2:7:8.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 8:5. Their difference is 125. What is their sum?

A. 403

B. 519

C. 201

D. 445

Correct Answer: Option A

Explanation:
Numbers 8k, 5k. Difference |8-5|k = 125 ⇒ k = 41. Sum = (8+5)k ≈ 403.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Two numbers are in ratio 11:4. Their difference is 116. What is their sum?

A. 621

B. 695

C. 585

D. 292

Correct Answer: Option C

Explanation:
Numbers 11k, 4k. Difference |11-4|k = 116 ⇒ k = 16. Sum = (11+4)k ≈ 585.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 5:8. After 12 years, the ratio becomes 6:11. Present age of A is?

A. 60 years

B. 55 years

C. 50 years

D. 110 years

Correct Answer: Option B

Explanation:
Let ages 5k and 8k. Then (5k + 12)/(8k + 12) = 6/11. Solving gives k ≈ 11, age of A = 5*11 = 55.

This question belongs to: Maths Ratio and Proportion