Răspuns :
x=prima cutie
y=a doua cutie
x+y=357
x=2y
2y+y=357
3y=357
y=357:3
y=119
x=2y
x=2*119
x=238
y=a doua cutie
x+y=357
x=2y
2y+y=357
3y=357
y=357:3
y=119
x=2y
x=2*119
x=238
357:3=119 bomboane intr-o cutie
respectiv 119x2=238 bomboane in cealalta
respectiv 119x2=238 bomboane in cealalta