Question

The ratio of copper and zinc in an alloy is 5 : 3. If the weight of copper in the alloy is 30.5 g, find the weight of zinc in it.

Answer 1

Let the weight of copper be 5x and the weight of zinc be 3x.

According to the question,
5x = 30.5 g
$\Rightarrow x=\frac{30.5}{5}=6.1\mathrm{g}$

Hence, the weight of zinc in the alloy is $3\times 6.1=18.3\mathrm{g}$.