Primul mod:
Primul robinet:
198l........1min
xl..........3min
x=3*198=594
Al doilea robinet:
198-90=108l/min
108l....1min
yl....3min
y=3*108=324l
In total: 594+324=918
Exercitiul: (3*198)+[(198-90)*3]=594+(108*3)=594+324=918
Al doilea mod:
Prin al doilea robinet curge: 198-90=108
In total: (198+108)*3=306*3=918
Exercitiul: [198+(198-90)]*3=(198+108)*3=306*3=918