a+b+c =1940
a/b=4 r 13 ;a =4b +13
b /c =5 br11 ;c =b -11 /5 inlocuim in prima relatie pe a si c
4b +13+b +b -11/5 =1940 numitor comun 5
20b +65+5b +b -11 =9700
26b =9700-65+11
26b =9646
b =371
a =4b +13
a =4*371 +13
a =1484+13
a =1497
c =b -11 /5
c =371-11 /5
c =360/5
c =72