document.write( "Question 557444: You have 30L of a 60% acid solution, how many liters of acid do you need to add to have a solution that has a concentration of 80%? \n" ); document.write( "

Algebra.Com's Answer #362608 by Earlsdon(6294) $\"\"$ $\"About$

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Let x = the required number of liters of acid to be added to the 30 liters of 60% acid solution to obtain 30+x liters of 80% acid solution.
\n" ); document.write( "You can set up the equation to solve for x like this:
\n" ); document.write( "30(0.6)+x = (30+x)(0.8) Simplify and solve for x.
\n" ); document.write( "18+x = 24+0.8x Subtract 0.8x from both sides.
\n" ); document.write( "18+0.2x = 24 Now subtract 18 from both sides.
\n" ); document.write( "0.2x = 6 Finally, divide both sides by 0.2
\n" ); document.write( "x = 30 liters. \n" ); document.write( "

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