Question

bunicul are in curte 26 de gaste,curci si rate.stiind ca gaste si cuci sunt 20,iar curci si rate sunt 14,afla cate pasari de fiecare fel are bunicul.va multumesc

Answer 1

Notez: g-gaste, c-curci, r-rate
g+c=20
c+r=14
c+g+r=26 => g=26-14, g=12=> c=2012, c=8=> r=14-8, r=6
Raspuns: 12 gaste,8 curci, 6 rate

Answer 2

g + c + r = 26
g + c = 20   =>  g = 20 - c 
c + r = 14    => r = 14 - c
20 - c + c + 14 - c = 26
- c = 26 - 20 - 14
- c = - 8 
c = 8
g = 20 - 8
g = 12
r = 14 - 8
r = 6
verificare: 12 + 8 + 6 = 26