If a:b = 5:10 and b:c = 10:4, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 5:10 and b:c = 10:4, then a:b:c = ?

A. 5:11:4

B. 5:10:4

C. 4:10:5

D. 10:20:8

Answer: Option B

Combine ratios: a:b = 5:10, b:c = 10:4 ⇒ a:b:c = 5:10:4.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in the ratio 5:9 and their sum is 612. Find the numbers.

A. 430 and 774

B. 215 and 387

C. 196 and 394

D. 240 and 375

Correct Answer: Option B

Explanation:
Numbers = 5k and 9k. 5k + 9k = 612 ⇒ k = 43. Thus, numbers are 215 and 387.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Milk and water are in ratio 5:7 in a 476 L mixture. Quantity of milk?

A. 278 L

B. 396 L

C. 198 L

D. 230 L

Correct Answer: Option C

Explanation:
Total parts = 12. Milk = [5 / (5+7)] × 476 = 198 L.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 7:4. After 9 years, the ratio becomes 10:5. Present age of A is?

A. 336 years

B. 161 years

C. 173 years

D. 168 years

Correct Answer: Option D

Explanation:
Let ages 7k and 4k. Then (7k + 9)/(4k + 9) = 10/5. Solving gives k ≈ 24, age of A = 7*24 = 168.

This question belongs to: Maths Ratio and Proportion