document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=861253>Question 861253</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many grams of salt must be added to 90 grams of a 20% salt solution to make a 25% salt solution?\r<BR>\n" );
document.write( "\n" );
document.write( "I can't seem to figure out the formula.  I tried x+90(.20)=0.25 and various variations, but I just can't get the formula to work.  I would appreciate your help to at least get the equation. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #518925 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39630)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=518925\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A thorough lesson on this type of exercise problem is in this link:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<a  rel=nofollow HREF=\"http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev\">two-part mixture for known final concentration and one part known but other part unknown.</a><BR>\n" );
document.write( "http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "I believe you were or are missing a denominator expression representing the total amount of resulting solution.  What you showed in your equation is a quantity of salt as expression, and a fraction of salt for resulting solution.  \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Study the lesson; but also understand that concentration is a ratio like this:<BR>\n" );
document.write( "(amount of solute)/(amount of solution containing the solute).<BR>\n" );
document.write( "You want this RATIO to be 0.25 if keeping with decimal fractions; or 25 if keeping with percentage concentration units.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Final answer seems to be 6 grams.  This result checks. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );