25% of A = 40% of B = 1/5 of C. Find A:B:C. MCQ with Answer and Explanation

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25% of A = 40% of B = 1/5 of C. Find A:B:C.

A. 8:10:5

B. 8:5:10

C. 10:8:5

D. 5:8:10

Answer: Option B

Solution (By JKSSB Mock Tests)

Let 0.25A = 0.4B = 0.2C = k. Then A=4k, B=2.5k, C=5k. Multiply by 2: A:B:C = 8:5:10.

This question belongs to: Maths Percentage

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Question #1

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Fresh grapes contain 68% water while dry grapes contain 20% water. How many kilograms of dry grapes can be obtained from 100 kg of fresh grapes?

A. 50 kg

B. 32 kg

C. 80 kg

D. 40 kg

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Correct Answer: Option D

Explanation:
Quantity of pulp in fresh grapes = 100% - 68% = 32%. So, pulp = 32 kg. In dry grapes, pulp is 100% - 20% = 80%. Let dry grapes be D kg. 80% of D = 32 implies D = (32 / 0.8) = 40 kg.

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Question #2

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Price of sugar increased 30%. Expenditure to rise only 10%. Consumption reduced by:

A. 14.5%

B. 18%

C. 16.67%

D. 15.38%

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Correct Answer: Option D

Explanation:
1.3 × x = 1.1 → x = 1.1/1.3 ≈ 0.84615, reduction 15.38%.

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Question #3

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If the length of a rectangle is increased by 25%, by what percentage must the width be decreased to keep the area unchanged?

A. 15%

B. 33.33%

C. 20%

D. 25%

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Correct Answer: Option C

Explanation:
Required decrease = (25 / 125) * 100 = 20%.

This question belongs to: Maths Percentage

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