Question

intr-o curte sunt 120 pasari si oi, Cate pasari si oi sunt in curte daca in total sunt 298 picioare?

Answer 1

p+q = 120                       · 2
2p +4q =298 

2p+ 4q = 298
2p +2q =240 le scadem 
-------------------------
  /      2q = 298 -240   ;       2q = 58     q = oi= 58:2=29
p= 120 -29=91 pasari

Answer 2

p+q = 120 · 2 2p +4q =298 2p+ 4q = 298 2p +2q =240 le scadem ------------------------- / 2q = 298 -240 ; 2q = 58 q = oi= 58:2=29 p= 120 -29=91 pasari