Gasolina Adulterada

Synopsis: A user discovers that the fuel has put more alcohol in gasoline than allowed by law. Immediately the owner of the gas station and you calculate how much pure gasoline must be added to the post so that the fuel tank is the correct specification. The ending is happy.
Source: Unicamp - M3, Mathematics Multimedia.
URL: http://m3.ime.unicamp.br/recursos/1314