If a:b = 4:9 and b:c = 9:10, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 4:9 and b:c = 9:10, then a:b:c = ?

A. 8:18:20

B. 4:10:10

C. 3:9:11

D. 4:9:10

Answer: Option D

Combine ratios: a:b = 4:9, b:c = 9:10 ⇒ a:b:c = 4:9:10.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in the ratio 3:14 and their sum is 614. Find the numbers.

A. 99 and 524

B. 108 and 504

C. 118 and 488

D. 216 and 1008

Correct Answer: Option B

Explanation:
Numbers = 3k and 14k. 3k + 14k = 614 ⇒ k = 36. Thus, numbers are 108 and 504.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 3:3 and b:c = 3:6, then a:b:c = ?

A. 2:3:7

B. 3:3:6

C. 3:4:6

D. 6:6:12

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:3, b:c = 3:6 ⇒ a:b:c = 3:3:6.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 3:5 and b:c = 5:9, then a:b:c = ?

A. 2:5:10

B. 3:6:9

C. 3:5:9

D. 6:10:18

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:5, b:c = 5:9 ⇒ a:b:c = 3:5:9.

This question belongs to: Maths Ratio and Proportion