document.write( "Question 460415: I have problems on knowing where to start on story problems and what to do with them. Here is an example.\r
\n" ); document.write( "\n" ); document.write( "How much pure acid must be mixed with 80 liters of 10% acid to get 30% acid?
\n" ); document.write( "

Algebra.Com's Answer #315780 by robertb(5830)\"\" \"About 
You can put this solution on YOUR website!
let x = # liters of pure acid to be added. Pure acid is 100% acid (This sounds stupid, but it really is important.)
\n" ); document.write( "Then \r
\n" ); document.write( "\n" ); document.write( "1.00x + 0.10*80 = 0.30(x+80)\r
\n" ); document.write( "\n" ); document.write( "==> x + 8 = 0.30x + 24\r
\n" ); document.write( "\n" ); document.write( "==> 0.70x = 16\r
\n" ); document.write( "\n" ); document.write( "==> \"x+=+22%266%2F7\" liters.
\n" ); document.write( "
\n" );