Question

Daca Livia ar da Soranei 3 lei,cele doua fete ar avea aceeasi suma de bani.Cat are fiecare,daca impreuna au 20 de lei?

Answer 1

Livia-l
Sirana-s
l-3=s+3
l+s=20
l-3=s+3
l=s+3+3
l=s+6
s+6+s=20
s×2=20-6
s×2=14
s=14:2
s=7
l=s+6
l=7+6
l=13