[tex]L = \frac{2}{5}L + (L-\frac{2}{5}L)\frac{1}{3}+(L- (L-\frac{2}{5}L)\frac{1}{3})\frac{1}{4}+300.
= 300^{} +\frac{2}{5}L + \frac{3}{5}L\frac{1}{3} + (L-\frac{3}{5}L\frac{1}{3})\frac{1}{4}
= 300^{} +\frac{2}{5}L + \frac{1}{5}L + \frac{4}{5}L\frac{1}{4}
= 300^{} +\frac{2}{5}L + \frac{1}{5}L + \frac{1}{5}L
= 300^{} +\frac{4}{5}L =\ \textgreater \ 300 = \frac{1}{5}L .
L = 1500 ml = 1.5 litri[/tex]