x - pojemność bojlera
x=\frac{1}{3}x+0,25x+25,25
x-\frac{1}{3}x+\frac{25}{100}x=25,25
x-\frac{1}{3}x+\frac{1}{4}x=25,25
x-\frac{4}{12}x+\frac{3}{12}x=25,25
x-\frac{7}{12}x=25,25
$\frac{5}{12}x=25,25
x=25,25:\frac{5}{12}
x=25,25*\frac{12}{5}
x=\frac{2525}{100}*\frac{12}{5}
x=\frac{101}{4}*\frac{12}{5}=\frac{101}{1}*\frac{3}{5}=\frac{303}{5}=60,6litra