Question

Intr-o curte sunt in total 56 pasari si vite,care au impreuna 124 picioare.Cate pasari si cate vite sunt?

Answer 1

Notam cu $x$ pasarile si cu $y$ vitele
$x+y=56 \\ x*2+y*4=124 \\ x=56-y \\ (56-y)*2+4y=124 \\ 112-2y+4y=124 \\ 2y=12 \\ y=6 \\ x=56-y=56-12= \\ x=44 \\ Verificare : 44*2+6*6=88+36=124$