Respostas

2013-11-07T18:31:01-02:00
300 - 100
171 -  x

300x=17100
x=17100/300
x= 57%

Espero ter ajudado'
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2013-11-07T18:31:52-02:00
300 => 100%
171 => x%
171.100/300 = x
x = 171.1/3
x = 171/3
x = 57% 
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