Respostas

2013-10-16T15:03:15-03:00
x+0,8x+0,72x=1890
2,52x=1890
x= \frac{1890}{2,52}
x=750

Sergio:540,00
Luiz: 750,00
Maria: 600,00

2 5 2
2013-10-16T16:32:12-03:00
Luiz recebeu x
marta 0,8x
sergio 0,8x0,9=0,72x

x+0,8x+0,72x=1890

2,52x=1890

x=1890/2,52

x=750

Luiz
R$750,00
Maria
R$600,00
Sergio
R$540,00
3 5 3