Răspuns :
a+b+c=300
b=a+20
c=3b
(a+20)*3=c
a+a+20+3a+60=300
5a+80=300
5a=220
a=44
b=64
c=192
b=a+20
c=3b
(a+20)*3=c
a+a+20+3a+60=300
5a+80=300
5a=220
a=44
b=64
c=192