document.write( "Question 198989: How much 15% acid must you add to 4 liters of 40% acid to obtain a mixture that is 25% acid? \n" ); document.write( "
Algebra.Com's Answer #149476 by RAY100(1637)![]() ![]() ![]() You can put this solution on YOUR website! Let x = amt of acid \n" ); document.write( ". \n" ); document.write( ".4(4) + .15x = .25(4+x) \n" ); document.write( ". \n" ); document.write( "1.6 + .15 x = 1 + .25x \n" ); document.write( ". \n" ); document.write( ".6 = .1x \n" ); document.write( ". \n" ); document.write( "x= 6 liters \n" ); document.write( ". \n" ); document.write( "check \n" ); document.write( ". \n" ); document.write( ".4(4) + .15(6) = .25(4 + 6) \n" ); document.write( "1.6 + .9 = 2.5 ,,,,,ok \n" ); document.write( " |