x=carti
y=caiete
5x+3y=64
3x+5y=48
----------------------
8x+8y=112
8(x+y)=112
x+y=112:8
x+y=14
x=14-y
5x+y=64
5(14-y)+3y=64
70-5y+3y=64
70-64=5y-3y
6=2y
3=y
x+y=14
x=14-3
x=11
12x11+1x3=135>103
11x11+2x3=127>103
10x11+3x33=119>103
9x11+4x3=111>103
8x11+5x3=103
8carti si 5 caiete=103 lei