document.write( "Question 718157: A chemist, has one 30 litre bottle of 15% hydrochloric acid and one 30 litre bottle of \n" );
document.write( "90% hydrochloric acid. He mixes 20 litres of 60% hydrochloric acid and then pours 5 L of that \n" );
document.write( "solution into the bottle containing the 90% hydrochloric acid. How strong is the acid in that bottle \n" );
document.write( "now?\r \n" );
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document.write( "5+30=35 \n" );
document.write( "0.6(5)+0.9(30)=30\r \n" );
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document.write( "30/35= ~85.71%\r \n" );
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document.write( "But that answer is incorrect according to the textbook which said 83.5%... \n" );
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