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Question

An alloy consists of $7$ parts of zinc and $33$ parts of copper. Find the percentage of copper in the alloy.

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Solution

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Percentage of copper $= \frac{P a r t s o f c o p p e r}{p a r t s o f c o p p e r + p a r t s o f z i n c} \times 100$
$= \frac{33}{33 + 7} \times 100$
$= \frac{33}{40} \times 100$
$= \frac{165}{2}$
$= 82.5$

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