0.03 = \frac{70 \times 0.2}{70 + x} \\ 0.03(70 + x) = 70 \times 0.2 \\ 2.1 + 0.03x = 14 \\ x = \frac{14 - 2.1}{0.03} \\ x = 396.67gr" alt="
0.03 = \frac{70 \times 0.2}{70 + x} \\ 0.03(70 + x) = 70 \times 0.2 \\ 2.1 + 0.03x = 14 \\ x = \frac{14 - 2.1}{0.03} \\ x = 396.67gr" align="absmiddle" class="latex-formula">
p(Воды)=1гр/мл
1мл---------1гр
х мл-------396.67гр
х=396.67мл