Respostas

2014-01-30T12:08:47-02:00
80 ----------- 100 %
  x ----------- 25 %

100 x = 80 . 25
100 x = 2 000
x = 2 000 / 100
x = 20

25% de 80 = 20 
1 5 1
100 x = 80 . 25
100 x = 2 000
x = 2 000 / 100
x = 20

25% de 80 = 20
'-'
2014-01-30T13:26:19-02:00