Se foloseste regula de 3 simpla:
[tex]60 \: de \: ace........................120.48g \\ 12 \: ace............................xg \\ \\ = > x = \frac{12 \times 120.48}{60} \\ se \: simplifica \: 12 \: cu \: 60 = > \frac{12}{60} = \frac{1}{5} \\ = > \frac{120.48}{5} = 24.96 \: aproximativ \: 25g[/tex]
