There is an alloy (A) of silver and copper. A certain weight of this alloy is mi

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 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).

Options:

A . 80%

B . 90%

C . 75%

D . 84%

Answer: Option A
:
A
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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