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Question
An alloy of tin and copper consists of 15 parts of tin and 105 parts of copper. Find the percentage of copper in the alloy?
Solution
Composition of the alloy = 15 parts of tin + 105 parts of copper
= 120 parts
\[ \therefore \text{ Percentage of tin }= \frac{15}{120} \times 100\]
\[ = 12 . 5 \% \]
\[\text{ Also, percentage of copper }= \frac{105}{120} \times 100\]
\[ = 87 . 5 \%\]
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