If a:b = 5:8 and b:c = 8:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:8 and b:c = 8:6, then a:b:c = ?

A. 4:8:7

B. 10:16:12

C. 5:8:6

D. 5:9:6

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:8, b:c = 8:6 ⇒ a:b:c = 5:8:6.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 7:7 and b:c = 7:6, then a:b:c = ?

A. 7:8:6

B. 7:7:6

C. 6:7:7

D. 14:14:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:7, b:c = 7:6 ⇒ a:b:c = 7:7:6.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is?

A. 90 years

B. 85 years

C. 81 years

D. 170 years

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Correct Answer: Option B

Explanation:
Let ages 5k and 7k. Then (5k + 12)/(7k + 12) = 7/10. Solving gives k ≈ 17, age of A = 5*17 = 85.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 12:7. Their difference is 51. What is their sum?

A. 228

B. 456

C. 504

D. 596

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Correct Answer: Option B

Explanation:
Numbers 12k, 7k. Difference |12-7|k = 51 ⇒ k = 10. Sum = (12+7)k ≈ 456.

This question belongs to: Maths Ratio and Proportion

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