Răspuns :
120:2=60
60+15=75 ( mere in primul cos)
120-75=55( mere in cel de-al doilea cos)
60+15=75 ( mere in primul cos)
120-75=55( mere in cel de-al doilea cos)
x+y=120
x-15=y+15
x=y+15+15
x=y+30
y+30+y=120
2y=120-30
2y=90
y=90:2
y=45
x=45+30
x=75
x=75
x-15=y+15
x=y+15+15
x=y+30
y+30+y=120
2y=120-30
2y=90
y=90:2
y=45
x=45+30
x=75
x=75