Răspuns :
8 robinete..........120 min...........1 bazin
10 robinete..........x min.............1 bazin
8/10=120/x
x=(120 ori 10) : 8=1200 : 8
x=150(minute)
10 robinete..........x min.............1 bazin
8/10=120/x
x=(120 ori 10) : 8=1200 : 8
x=150(minute)