Răspuns:
[tex]a+b+c=502\\\\b=3a\\\\c:b=7rest2= > c=7b+2= > c=21a+2\\\\a+3a+21a+2=502\\\\25a=502-2= > a=500:25= > a=20\\\\b=3*20= > b=60\\\\c=21*20+2= > c=422[/tex]
