Răspuns :
a+b+c=778
a+b=580
b+c=451
(a+b)+c=778
580+c=778
c=778-580
c=198
a+(b+c)=778
a+451=778
a=778-451
a=327
327+b+198=778
525+b=778
b=778-525
b=253
a+b=580
b+c=451
(a+b)+c=778
580+c=778
c=778-580
c=198
a+(b+c)=778
a+451=778
a=778-451
a=327
327+b+198=778
525+b=778
b=778-525
b=253
580+c=778
c=778-580
c=198
b+198=451
b=451-198
b=253
a+253=580
a=580-253
a=327