If a:b = 7:5 and b:c = 5:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:5 and b:c = 5:5, then a:b:c = ?

A. 6:5:6

B. 7:6:5

C. 7:5:5

D. 14:10:10

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:5, b:c = 5:5 ⇒ a:b:c = 7:5:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:6 in a 413 L mixture. Quantity of milk?

A. 207 L

B. 412 L

C. 206 L

D. 245 L

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Correct Answer: Option C

Explanation:
Total parts = 12. Milk = [6 / (6+6)] × 413 = 206 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 4:5 and b:c = 5:8, then a:b:c = ?

A. 3:5:9

B. 4:6:8

C. 4:5:8

D. 8:10:16

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:5, b:c = 5:8 ⇒ a:b:c = 4:5:8.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 4:3 and their sum is 631. Find the numbers.

A. 380 and 258

B. 360 and 270

C. 720 and 540

D. 347 and 287

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Correct Answer: Option B

Explanation:
Numbers = 4k and 3k. 4k + 3k = 631 ⇒ k = 90. Thus, numbers are 360 and 270.

This question belongs to: Maths Ratio and Proportion

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