Question

The ratio of copper and zinc in an alloy is $9:5$. If the weight of copper in the alloy is $48.6g$, find the weight of zinc in the alloy.

Answer 1

Let $x$ be the weight of zinc.

$\frac{\text{Weight of copper}}{\text{weight of zinc}}=\frac{9}{5}$

$\Rightarrow$ $\frac{9}{5}=\frac{48.6}{x}$

$\Rightarrow$ $x=48.6\times \frac{5}{9}$

$\therefore$ $x=\frac{48.6\times 5}{9}=27$

Hence, the $27g$ weight of zinc in the alloy.