3robinete.............2 pompe ................. 31 hl/h
3robinete.............8 pompe ................. 79 hl/h
8-2= 6 pompe...........79-31=48 hl/h
1 pompa..........48:6=8 hl/h
3robinete.........................31-2×8=15 hl/h
1robinet.................................15:3=5 hl/h
1pompa 8 hl/h
1robinet 5 hl/h