Respostas

2013-11-10T23:33:48-02:00
  x    de 120 = 12  
100
120x  = 12
100
120x = 12 * 100
120x = 1.200
x = 1.200 : 120
x = 10
Resposta: 10%
2013-11-10T23:40:10-02:00
12= 120 X x 
                100
12X100= 120x
1200=120x
x= 1200/120
x=10
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