Question

Intr-o ferma de pasari sunt 425 de rate si gaste ,297 de gaste si curci si 210 de rate si curci.Cate pasari sunt din fiecare fel ?

Answer 1

notam rate=r;gaste=g;curci=c
r+g=425
g+c=297
r+c=210
2r+2g+2c=932
2(r+g+c)=932
r+g+c=466
r+g=425
c=466-425=41
g+c=297
g+41=297
g=297-41=256
r+c=210
r+41=210
r=210-41=169
169+256+41=466 (verificare)