Bronze is an alloy of copper and zinc in the ratio of 8:3 by mass.

What mass of copper and zinc would be used to manufacture a bronze figure of 3.63 kilogrammes???

Giving your answers in the simplest form

(i) $\displaystyle \frac {5}{8} + \frac{9}{16} - \frac{3}{4} $

(ii) $\displaystyle \frac {7}{10} - \frac{3}{8} / \frac{3}{4} +\frac {6}{5} $

Steven