Răspuns :
a+b+c=903
a+b=684
b+c=598
684+c=903
c=903-684
c=219
b+219=598
b=598-219
b=379
a+379=684
a=684-379
a=305
Verificare : 305+379+219=903
a+b=684
b+c=598
684+c=903
c=903-684
c=219
b+219=598
b=598-219
b=379
a+379=684
a=684-379
a=305
Verificare : 305+379+219=903