Respostas

2013-11-21T17:55:39-02:00
3,5 kg → 4,55 
6,5 kg → x

x= \frac{4,55*6,5}{3,5}

x=8,45
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2013-11-21T17:58:59-02:00
3,5kg - 4,55
6,5 kg - x

x=4,55 x6,5/3,5
x=8,45

6,5 kg custam R$8,45.
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