fie x cantitatea totala de apa
Prima oara se scot: [tex] \frac{1}{4}*x[/tex]
raman: [tex]x- \frac{1}{4} *x=x- \frac{x}{4} = \frac{4x-x}{4}= \frac{3x}{4} [/tex]
a doua oara se scot: [tex] \frac{4}{9} * \frac{3x}{4} = \frac{x}{3} [/tex]
raman: [tex] \frac{3x}{4} - \frac{x}{3}= \frac{9x-4x}{12} = \frac{5x}{12} [/tex]
a treia oara se scot: [tex] \frac{2}{5} * \frac{5x}{12} = \frac{x}{6} [/tex]
raman: [tex] \frac{5x}{12} - \frac{x}{6} = \frac{5x-2x}{12} = \frac{3x}{12} = \frac{x}{4} [/tex]
[tex] \frac{x}{4} =100[/tex]
x=4*100
x=400 litri
