document.write( "Question 164106: How many kilograms of pure alcohol must be added to 40 kg of a 70% alcohol solution to produce an 85% alcohol solution? \n" ); document.write( "
Algebra.Com's Answer #120983 by alicealc(293)![]() ![]() ![]() You can put this solution on YOUR website! Let pure alcohol = x kg\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x + (70/100)*40 = (85/100)*(x + 40) \n" ); document.write( "<=> x + 0.7*40 = 0.85*(x + 40) \n" ); document.write( "<=> x + 28 = 0.85x + 34 \n" ); document.write( "<=> x - 0.85x = 34 - 28 \n" ); document.write( "<=> 0.15x = 6 \n" ); document.write( "<=> x = 6/0.15 \n" ); document.write( "<=> x = 40\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "so 40 kg of pure alcohol must be added \r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |