Question

4.5g of an alloy of copper and zinc contains 3.5 g of copper. what weight of copper will there be in 18.9 g of the alloy

Answer 1

4.5g of alloy gives 3.5g of copper
18.9g ?
copper in 18.9 g of alloy is
copper=
$\frac{18.9 \times 3.5}{4.5} grams$
14.7 grams of copper is found in 18.9 grams of copper