Respostas

2014-04-08T21:21:31-03:00
R= 30,00

x.3+30=120
x.3=120-30
x.3=90
x=90:3
x=30
2014-04-08T21:35:30-03:00
Mariene possuia 30 reais, pois 30 x 3 =  90, 90 + 30 = 120