sasha-stevens_60c07232258c4
sasha-stevens_60c07232258c4
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x+y=600 7,5x+2,5y=3000 x=600-y 7,5.(600-y)+2,5y=3000 4500-7,5y+2,5y=3000 -5y=3000-4500 y=-1500/-5 y=300 então havia 300 adultos e 300 crianças 7,5.300+2,5.300 2250+750=3000