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In 50gm alloy of gold and silver. The gold is 80% by weight. How much gold should be mixed to this alloy so that the weight of gold would become 95%?

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200 gm

150 gm

50 gm

10 gm

answer is B.

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Detailed Solution

Concept: We should be aware of the percentage formula while answering questions of this type. For example in this case the formula for percentage weight of gold can be written as

.
Given:The total weight of an allow = 50gm
Net weight of gold

Find: Amount of gold that has to be added for the composition of gold to reach 95%.
As per the question, the gold is 80%
So, 80% of 50gm

Suppose that x gm of gold is mixed with this alloy
Question Image

Hence, the correct answer is option (2).

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