Răspuns :
a+b+c=200
a=b+25
c=b+55
inlocuim :
b+25+b+55=200
3b+80=200
3b=200-80
3b=120
b=120:3
b=40
a=40+25
a=65
c=40+55
c=95
a=b+25
c=b+55
inlocuim :
b+25+b+55=200
3b+80=200
3b=200-80
3b=120
b=120:3
b=40
a=40+25
a=65
c=40+55
c=95