Răspuns:
Explicație pas cu pas:
3robinete....................2pompe...................31hl
3robinete.....................8pompe...............79hl
................................6pompe..................48hl
Cati hl umple 1 pompa?
48:6=8
Cati hl umple 2 pompe
8 x 2=16
Cati hl umple 3 robinete
31-16=15
Csti hl umple 1 robinet?
15:3=5
Asa cred sper sa fie bine!