Question

Daca Razvan ii da Mariei 100 de lei ,fiecare va avea in pusculita 400 de lei.Cati lei are fiecare?

Answer 1

x-100=400              x=500            Razvan
y+100=400             y=300            Maria

Answer 2

R-100=M+100...=> R=M+100+100
R+M=400*2...=>R+M=800 lei au impreuna

R=M+200
M+200+M=800
2M+200=800
2M=800-200
2M=600
M=600:2
M=300 lei are Mari
R=300+200
R=500 lei are Razvan

500+300=800 lei in total
500-100=300+100
400=400