20% of A = 30% of B = 1/6 of C. Ratio A:B:C: MCQ with Answer and Explanation

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20% of A = 30% of B = 1/6 of C. Ratio A:B:C:

A. 18:10:15

B. 10:15:18

C. 15:10:12

D. 15:10:18

Answer: Option D

Solution (By JKSSB Mock Tests)

Let 20%A=30%B=C/6 = k. A=5k, B=10k/3, C=6k → multiply by 3: 15:10:18.

This question belongs to: Maths Percentage

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Question #1

30% of 150 + 20% of 50 = ?

A. 65

B. 55

C. 60

D. 70

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Correct Answer: Option B

Explanation:
30% of 150 = 45, 20% of 50 = 10, sum = 55.

This question belongs to: Maths Percentage

Question #2

A student scored 72 marks out of 120. What is his percentage?

A. 70%

B. 60%

C. 65%

D. 55%

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Correct Answer: Option B

Explanation:
Percentage = (72/120) × 100 = 60%.

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Question #3

Machine depreciates 10% per year. Present value Rs. 81,000, value 2 years ago was:

A. 90,000

B. 1,10,000

C. 1,00,000

D. 1,20,000

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Correct Answer: Option C

Explanation:
Value 2 years ago = 81000 / (0.9×0.9) = 1,00,000.

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