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Question

# There is an alloy (A) of silver and copper. A certain weight of this alloy is mixed with 15 kg of pure Silver and melted. The new alloy (B) contains 90% of silver. If the same weight of alloy (A) is mixed with 10kg of a 90% silver alloy, the new alloy (C) is found to contain 84% silver. Find the percentage of silver in (A).

A
80%
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B
90%
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C
75%
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D
84%
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E
72%
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Solution

## The correct option is A 80%Use alligation and then the answer options Let the percentage of silver in alloy A be a Now substitute values from answer options such that all the criteria are satisfied. Answer is option (a) as shown below

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