[tex]dane:\\m = 40 kg\\d = 800\frac{kg}{m^{3}} \ - gestosc \ drewna \ debowego\\szukane:\\V = ?\\\\d = \frac{m}{V} \ \ /\cdot V\\\\d\cdot V = m \ \ /:d\\\\V = \frac{m}{d}\\\\V = \frac{40 \ \kg}{800\frac{kg}{m^{3}}}\\\\\underline{V = 0,05 \ m^{3}}[/tex]
