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