Răspuns :
a+b+c=1005
b=3a=>a=b/3
b=c-60=>c=b+60
b/3+b+b+60=1005
b/3+2b=1005-60
b/3+6b/3=945
7b=945x3
7b=2835
b=2835/7
b=405
a=405/3
a=135
c=405+60
b=465
b=3a=>a=b/3
b=c-60=>c=b+60
b/3+b+b+60=1005
b/3+2b=1005-60
b/3+6b/3=945
7b=945x3
7b=2835
b=2835/7
b=405
a=405/3
a=135
c=405+60
b=465