1. Calculam cati kl de apa curg intr-un minut prin cele 3 robinete:
360:36=10 kl apa
2. Calculam cati kl curg intr-un minut prin 4 robinete:
3 robinete.......10 kl apa
4 robinete ........ x
[tex]x= \dfrac{4*10}{3}= \dfrac{40}{3} \ kl[/tex]
3. Aflam in cat timp vor curge 120 kl de apa prin 4 robinete:
(4 robinete) 1 minut..........40/3 kl apa
(4 robinete) y minute........120 kl apa
[tex]y=120: \dfrac{40}{3}= \dfrac{120*3}{40}= \dfrac{360}{40} = 9\ minute[/tex]
In concluzie prin 4 robinete vor curge 120 kl de apa in 9 minute.
