Two alloys contain 70% and 40% copper respectively. In what ratio must they be mixed to obtain an alloy containing 50% copper? MCQ with Answer and Explanation

Question

Two alloys contain 70% and 40% copper respectively. In what ratio must they be mixed to obtain an alloy containing 50% copper?

A. 1:1

B. 1:2

C. 3:2

D. 2:1

Answer: Option B

Solution (By JKSSB Mock Tests)

By alligation: (70-50):(50-40) = 20:10 = 2:1. The ratio of the alloys is inverse: 1:2.

This question belongs to: Maths Percentage

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Marked 20% above CP, discount 10%. Profit %:

A. 8%

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C. 12%

D. 6%

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Correct Answer: Option A

Explanation:
CP=100, MP=120, SP=108, profit 8%.

This question belongs to: Maths Percentage

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A machine depreciates 12% per year. Its value after 1 year if purchased for Rs. 60,000 is:

A. 53,000

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Correct Answer: Option D

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Question #3

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A number increased by 15% is 138. The number is:

A. 120

B. 125

C. 110

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Correct Answer: Option A

Explanation:
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