In a mixture, the ratio of copper to zinc is 5:3. If 20% of the mixture is removed, what percentage of the remaining mixture is copper? MCQ with Answer and Explanation

Question

In a mixture, the ratio of copper to zinc is 5:3. If 20% of the mixture is removed, what percentage of the remaining mixture is copper?

A. 70%

B. 62.5%

C. 60%

D. 50%

Answer: Option B

Solution (By JKSSB Mock Tests)

Removing part of the mixture does not change the ratio. Copper proportion = 5 / (5+3) = 5/8. Percentage = (5/8) * 100 = 62.5%.

This question belongs to: Maths Percentage

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Question #1

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In a 40-litre mixture of milk and water, the ratio is 3:2. How many litres of water must be added to change the ratio to 1:2?

A. 28 L

B. 32 L

C. 24 L

D. 36 L

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Correct Answer: Option B

Explanation:
Milk = 24, water = 16. For milk:water = 1:2, water = 48, add 32 L.

This question belongs to: Maths Percentage

Question #2

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Allows 15% discount, still gains 19% profit. Markup % on CP:

A. 38%

B. 40%

C. 35%

D. 30%

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Correct Answer: Option B

Explanation:
CP=100, SP=119, MP=119/0.85=140, markup 40%.

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Question #3

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What is 30% of 30% of 200?

A. 18

B. 20

C. 30

D. 24

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Correct Answer: Option A

Explanation:
0.3 × 0.3 × 200 = 18.

This question belongs to: Maths Percentage

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