Two alloys have copper 60% and 35%. Mixed to get 50% copper. Ratio of mixing: MCQ with Answer and Explanation

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Two alloys have copper 60% and 35%. Mixed to get 50% copper. Ratio of mixing:

A. 3:5

B. 5:3

C. 3:2

D. 2:3

Answer: Option C

Solution (By JKSSB Mock Tests)

Using alligation: (60-50):(50-35) = 10:15 = 2:3, but the first alloy gives 10% excess, second gives 15% deficit, so ratio 15:10 = 3:2.

This question belongs to: Maths Percentage

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Question #1

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The population of a town increases by 8% annually. If its present population is 2,33,280, what was it 2 years ago?

A. 2,00,000

B. 2,10,000

C. 1,80,000

D. 1,90,000

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Correct Answer: Option A

Explanation:
Pop 2 yrs ago = 233280 / (1.08)² = 233280 / 1.1664 = 200000.

This question belongs to: Maths Percentage

Question #2

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What is 30% of 400 minus 15% of 200?

A. 80

B. 90

C. 70

D. 100

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Correct Answer: Option B

Explanation:
30% of 400 = 120, 15% of 200 = 30, difference = 90.

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Question #3

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In a mixture of 120 litres, the ratio of milk and water is 2:1. How much water is added to change the ratio to 1:2?

A. 110 L

B. 100 L

C. 120 L

D. 130 L

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Correct Answer: Option C

Explanation:
Milk=80, water=40. For 1:2, water=160, add 120 L.

This question belongs to: Maths Percentage

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