Question

Victor rezolva in cinci zile 80 de probleme. Se stie ca Victor incepand cu ziua a doua rezolva in fiecare cu trei probleme mai mult decat in ziua precedenta. Aflati cate probleme a rezolvat Victor in fiecare zi

Answer 1

al--l
bl--l3
cl--l3 3
dl--l3 3 3
el--l3 3 3 3
3x10=30 surplusul
80-30=50 eliminam surplusul
50:5=10 probleme rezolva in a zi
10+3=13 probleme rezolba in b zi
13+3=16 probleme rezolva in c zi
16+3=19 probleme rezolva in d zi
19+3=22 probleme rezolva in e zi

P:10+13+16+19+22=80