document.write( "Question 749386: Plz some1 help me to solve this problem:\r \n" );
document.write( "\n" );
document.write( "An 8 litre cylinder contains a mixture of oxygen \n" );
document.write( "and nitrogen, the volume of oxygen being 16% of \n" );
document.write( "the total volume. A few litres of the mixture is \n" );
document.write( "released and an equal amount of nitrogen is added. \n" );
document.write( "Then the same amount of the mixture as before is \n" );
document.write( "released and replaced by nitrogen for the second \n" );
document.write( "time. As a result, the oxygen content becomes 9% of \n" );
document.write( "the total volume. How many litres of mixture is \n" );
document.write( "released each time? \n" );
document.write( " \n" );
document.write( "
![\"\"](\"/images/stars/stars-13.gif\")
