document.write( "Question 921464: How much water should be mixed to a 500 ml of 30% solution of alcohol to have a resulting concentration of 20%? \n" );
document.write( "A.200 ml \n" );
document.write( "B.250 ml \n" );
document.write( "C.500 ml \n" );
document.write( "D.1000 ml \n" );
document.write( "E.2000 ml \n" );
document.write( "
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