Fie x cantitatea totala de apa
I. [tex] \frac{x}{4} [/tex]
[tex] R_{1} [/tex]: [tex]x- \frac{x}{4} = \frac{3x}{4} [/tex]
II. [tex] \frac{4}{9} * \frac{3x}{4} = \frac{x}{3} [/tex]
[tex] R_{2} [/tex]: [tex] \frac{3x}{4} - \frac{x}{3} = \frac{9x}{12} - \frac{4x}{12} = \frac{5x}{12} [/tex]
III. [tex] \frac{2}{5} * \frac{5x}{12} = \frac{x}{6} [/tex]
[tex] R_{3} [/tex]: [tex] \frac{5x}{12} - \frac{x}{6} = \frac{5x}{12} - \frac{2x}{12} = \frac{3x}{12} = \frac{x}{4} [/tex]
[tex] \frac{x}{4} =100[/tex]
x=4*100
x=400 litri
