varianta 1
suprafat buvcatariei 3*5=15m²=150000cm²
suparafata unei placutede gresie 20*20=400cm²
nr gresii=150000:400=1500:4=750:2=375 gresii
varianta 2
numarde placute care incap pe lungime
5m:0,2m=5*5=25
nrde [placute care incap pe latime
3:0,2=3*5=15
numar totalde placutede gresie 25*15=375
as simple as that!!;