Răspuns :
X-cate clatite a fcut azi
Y-cate clatite a facut ieri
X+y=48
X=y+12
Y+12+y=48
X=y+12
2y=48-12
X=y+12
Y=17
X=29
Astazi am mancat 29 de clatite
Y-cate clatite a facut ieri
X+y=48
X=y+12
Y+12+y=48
X=y+12
2y=48-12
X=y+12
Y=17
X=29
Astazi am mancat 29 de clatite