Question

Me ajudem a resolver a número 2?

Answer 1

Sendo Aury = X
e Rui = Y

x+y=840
3y=x

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y=840-x

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3*(840-x)=x
2520-3x=x
-3x-x=-2520
-4x=-2520
x=-2520/-4
x=630

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y+x=840
y+630=840
y=840-630
y=210