Respostas

2014-05-07T20:53:16-03:00
80 - 120
x - 100

Inverte a regra de 3

80 - 100
x - 120

E resolve:
80/x = 100/120
x*100 = 80*120
x = (80*120)/100
x=9600/100
x=96
1 5 1