a+b+c=340
b=a+20
a+b> b+c cu 40,
adica a+b=b+c+40 rezulta ca a+b-b-c=40,ceea ce inseamna ca a-c=40, adica a>c cu 40
a=c+40
b=a+20
a+b+c=340 inlociund obtinem:
c+40+c+40+20+c=340
3xc+100=340
3xc=340-100
3xc=240
c=240:3
c=80
a=80+40
a=120
b=120+20
b=140
verific: 120+140+80=340 suma lor
Raspuns: 120, 140, 80