Question

REPEDE DAU COROANA URGENT!!!un farmier spune:am gaini si iepuri.cand numar capetele gasesc 100 .cand numar picioarele gasesc 240. cate gaini are fiermierul? a)60 b)50 c)80 d)20 e)40

Answer 1

x=gaini si y=iepuri

x+y=100

2x+4y=240

unde x=100-y si il inlocuim in ec a doua

2*(100-y)+4y=240

200-2y+4y=240

2y=40

y=40:2=20

x+20=100

x=100-20=80 ⇒

x=80 gaini si y=20 iepuri

rezultat corect c)80