document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=220420>Question 220420</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi - I got the answer to this by working it out but I cannot get to an equation. Can you help me?\r<BR>\n" );
document.write( "\n" );
document.write( "A class has a boy-girl ratio of 5:3. Three more girls join the class, changing the ratio of 10:7. How many students are now in the class?\r<BR>\n" );
document.write( "\n" );
document.write( "By trying and just plugging in numbers I got 30 and 18 plus 3 more, so now the total is 51 - but I'm not sure how to set it up as a problem!\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #165472 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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/cgi-bin/show-face.mpl?user=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=165472\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> b / g = 5 / 3\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "\"cross\" multiplying ___ 3b = 5g ___ 6b = 10g\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "b / (g+3) = 10 / 7\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "7b = 10g + 30\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "substituting ___ 7b = 6b + 30 ___ b = 30\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "substituting ___ 3(30) = 5g ___ 90 = 5g ___ 18 = g\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "original class is 48 (30 + 18) ___ new class is 51 (48 + 3) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );