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 10 kg of a 90 - silver alloy- the new alloy C is found to contain 84 - silver- Find the percentage of silver inA-A- 80 -B- 90 -C- 75 -D- 84 -E- 72 -

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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).

80%

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90%

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75%

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84%

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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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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

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