a+b+c=390
c=b+25
c=a-40
Afla toate numerele


Răspuns :

a+b+c=390
c=b+25 => b=c-25
c=a-40 => a=c+40
________________
c+40+c-25+c=390
3×c=390-40+25
3×c=350+25
3×c=375
c=375:3
c=125
b=125-25
b=100
a=125+40
a=165