document.write( "Question 653610: Trevon wants to make a 40% acid solution. He has already poured 6 fl. oz. of a 20% acid solution into a beaker. How many fl. oz. of a 80% acid solution must he add to this to create the desired mixture? \n" ); document.write( "

Algebra.Com's Answer #408452 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+x+\"$ = fl oz of 80% solution needed
\n" ); document.write( " $\"+.2%2A6+=+1.2+\"$ fl oz of acid in 20% solution
\n" ); document.write( "--------------
\n" ); document.write( " $\"+%28+.8x+%2B+1.2+%29+%2F+%28+x+%2B+6+%29+=+.4+\"$
\n" ); document.write( " $\"+.8x+%2B+1.2+=+.4%2A%28+x+%2B+6+%29+\"$
\n" ); document.write( " $\"+.8x+%2B+1.2+=+.4x+%2B+2.4+\"$
\n" ); document.write( " $\"+.4x+=+1.2+\"$
\n" ); document.write( " $\"+x+=+3+\"$
\n" ); document.write( "3 fl oz of 80% solution are needed
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+.8%2A3+%2B+1.2+%29+%2F+%28+3+%2B+6+%29+=+.4+\"$
\n" ); document.write( " $\"+%28+2.4+%2B+1.2+%29+%2F+9+=+.4+\"$
\n" ); document.write( " $\"+3.6+%2F+9+=+.4+\"$
\n" ); document.write( " $\"+3.6+=+.4%2A9+\"$
\n" ); document.write( " $\"+3.6+=+3.6+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );