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Exercicio sobre problemas questão de concurso não lembro
01) (UNESP 2007) Uma lapiseira, três cadernos
e uma caneta custam juntos, 33 reais. Duas
lapiseiras, sete cadernos e duas canetas custam
juntos, 76 reais. O custo de uma lapiseira, um
caderno e uma caneta, juntos, em reais, é:
a) 11.
b) 12.
c) 13.
d) 17.
e) 38.
preciso dessa formula para estudar para o concurso.
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