Respostas

2013-10-31T21:38:55-02:00
4a+4b=7
A=b+(b/2), A=3b/2

4(3b/2) +4b = 7
12b/2 +4b =7
6b+4b=7
10b=7
B=0,7

A=3b/2
2,1/2
1,05
Portanto 8 selos = 8*1,05 = 8,40
Alternativa E
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