If a:b = 5:4 and b:c = 4:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:4 and b:c = 4:6, then a:b:c = ?

A. 10:8:12

B. 5:5:6

C. 4:4:7

D. 5:4:6

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:4, b:c = 4:6 ⇒ a:b:c = 5:4:6.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 23 and 54.

A. 70

B. 35

C. 38

D. 77

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Correct Answer: Option B

Explanation:
Mean proportional = √(23 × 54) = √(1242) = 35.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 5:8. After 6 years, the ratio becomes 6:11. Present age of A is?

A. 74 years

B. 160 years

C. 85 years

D. 80 years

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Correct Answer: Option D

Explanation:
Let ages 5k and 8k. Then (5k + 6)/(8k + 6) = 6/11. Solving gives k ≈ 16, age of A = 5*16 = 80.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 15:6 and their sum is 521. Find the numbers.

A. 375 and 127

B. 720 and 288

C. 347 and 158

D. 360 and 144

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Correct Answer: Option D

Explanation:
Numbers = 15k and 6k. 15k + 6k = 521 ⇒ k = 24. Thus, numbers are 360 and 144.

This question belongs to: Maths Ratio and Proportion

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