Respostas

2013-10-31T16:25:13-02:00
Dá para resolver por regra de 3. Se:
3/4---------4,50
 3----------- x

 3*4,50= 0,75x
13,50=0,75x
13,50/0,75=x
x= R$18,00
2013-10-31T16:25:50-02:00
3/4Kg  ---  R$ 4,50
3 Kg    ---     x
3/4 x= 13,5
x= 13,5 : 3/4
x = 13.5 . 4/3
x = 54/3
x= 18 reais