If a:b = 4:6 and b:c = 6:8, then a:b:c = ? MCQ with Answer and Explanation

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

A. 3:6:9

B. 8:12:16

C. 4:6:8

D. 4:7:8

Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

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

A. 95 years

B. 85 years

C. 180 years

D. 90 years

Correct Answer: Option D

Explanation:
Let ages 6k and 5k. Then (6k + 5)/(5k + 5) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 3:7 and b:c = 7:9, then a:b:c = ?

A. 6:14:18

B. 3:8:9

C. 2:7:10

D. 3:7:9

Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:7, b:c = 7:9 ⇒ a:b:c = 3:7:9.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 6:4. After 5 years, the ratio becomes 9:7. Present age of A is?

A. 108 years

B. 114 years

C. 119 years

D. 228 years

Correct Answer: Option B

Explanation:
Let ages 6k and 4k. Then (6k + 5)/(4k + 5) = 9/7. Solving gives k ≈ 19, age of A = 6*19 = 114.

This question belongs to: Maths Ratio and Proportion