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Entre meus 35 amigos existem alguns que me devem R$ 250,00 cada, outros aos quais eu devo R$ 60,00 e alguns com os quais nao ha pendencias. Certo dia todos meus amigos que me deviam, vinheram pagar-me, e logo todos aqueles aos quais devia, vinheram me cobrar. Sabendo que ao final do dia eu estava com R$ 310,00, quantos dos meus amigos me deviam dinheiro?
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