If a:b = 7:4 and b:c = 4:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:4 and b:c = 4:4, then a:b:c = ?

A. 7:5:4

B. 6:4:5

C. 7:4:4

D. 14:8:8

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:4, b:c = 4:4 ⇒ a:b:c = 7:4:4.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 120 years

B. 65 years

C. 55 years

D. 60 years

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Correct Answer: Option D

Explanation:
Let ages 4k and 5k. Then (4k + 4)/(5k + 4) = 6/7. Solving gives k ≈ 15, age of A = 4*15 = 60.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 4:2 in a 505 L mixture. Quantity of milk?

A. 169 L

B. 672 L

C. 383 L

D. 336 L

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Correct Answer: Option D

Explanation:
Total parts = 6. Milk = [4 / (4+2)] × 505 = 336 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 3:10 and b:c = 10:8, then a:b:c = ?

A. 6:20:16

B. 3:11:8

C. 2:10:9

D. 3:10:8

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:10, b:c = 10:8 ⇒ a:b:c = 3:10:8.

This question belongs to: Maths Ratio and Proportion

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