3) 2 treimi=60m => 1 treime=60/2=30m =>3 treimi=60+30=90m => franghia are 3 treimi=90 m
4) x+2/3x=60 => (3x+2x)/3=60 => 5x=180 => x=180/5 => x=36m(prima bucata)2/3x=2/3*36=24m(a doua bucata)36+24=60m
5) 60+2/3*60=x(franghia)60+40=100m(franghia), x=100m are franghia
