Respostas

2013-12-13T15:25:46-02:00
15/x = 30/100
30x=1500
x=1500/30
x=50 alunos.
2 3 2
2013-12-13T16:22:55-02:00
30%.................15
100%................x

30x = 1500
x = 1500/30
x = 50