charlotte-allen_60ae8cd1c2da1
charlotte-allen_60ae8cd1c2da1
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x + y = 40 -> cabeças 2x - pato + 4y - porco = 128 pés 2x + 4y = 128 x + y = 40 (-2) -> para cancelar o x subtraia... 2y - > 4y - 2y/ = 48 -> 128 - 80 2y=48 y=48/2 y=24