Question

mat alguém me ajuuuuuuuuddddaaaa fale ponto. porrrr favorrrrrr

Answer 1

x + y = 60

x = 60 - y

2x + 4y = 220

2 ( 60 - y ) + 4y = 220

120 - 2y + 4y = 220

2y = 220 - 120

2y = 100

y = 100 / 2

y = 50

x = 60 - y

x = 60 - 50

x = 10

resposta : 50 vacas