document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=598753>Question 598753</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Stephen and Sara are brother and sister. Stephen has twice as many sisters as he has brothers. Sara has the same number of brothers as sisters.<BR>\n" );
document.write( "A)Set up a system of equations to model this situation. How did you figure out what each equation would be? Let d be the number of daughters that Stephen and Sara's parents have, and s be the number of sons that Stephen and Sara's parents have.<BR>\n" );
document.write( "B)How many sisters does Stephen have?<BR>\n" );
document.write( "C)How many sisters does Sara have?<BR>\n" );
document.write( "D)How many brothers does Stephen have?<BR>\n" );
document.write( "E)How many brothers does Sara have?   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #378690 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=378690\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+ ALIGN=MIDDLE  ALT=\"+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = number of Sons<BR>\n" );
document.write( "Stephen is 1 of the Sons, so he has <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+-+1+ ALIGN=MIDDLE  ALT=\"+s+-+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" > brothers<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+ ALIGN=MIDDLE  ALT=\"+d+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = number of daughters, which is number of sisters he has<BR>\n" );
document.write( "given:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+2%2A%28+s+-+1+%29+ ALIGN=MIDDLE  ALT=\"+d+=+2%2A%28+s+-+1+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "Sarah is one of the daughters, so she has<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+-+1+ ALIGN=MIDDLE  ALT=\"+d+-+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sisters<BR>\n" );
document.write( "The number of her brothers is the number of Sons<BR>\n" );
document.write( "given:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+d+-+1+ ALIGN=MIDDLE  ALT=\"+s+=+d+-+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "From (2),<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+s+%2B+1+ ALIGN=MIDDLE  ALT=\"+d+=+s+%2B+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute (2) into (1)<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+%2B+1+=+2s+-+2+ ALIGN=MIDDLE  ALT=\"+s+%2B+1+=+2s+-+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+3+ ALIGN=MIDDLE  ALT=\"+s+=+3+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+s+%2B+1+ ALIGN=MIDDLE  ALT=\"+d+=+s+%2B+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+4+ ALIGN=MIDDLE  ALT=\"+d+=+4+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "(B)<BR>\n" );
document.write( "Stephen has <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+=+4+ ALIGN=MIDDLE  ALT=\"+d+=+4+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sisters<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "(C)<BR>\n" );
document.write( "Sarah has <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d+-+1+=+3+ ALIGN=MIDDLE  ALT=\"+d+-+1+=+3+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sisters<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "(D)<BR>\n" );
document.write( "Stephen has <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+-+1+=+2+ ALIGN=MIDDLE  ALT=\"+s+-+1+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > brothers<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "(E)<BR>\n" );
document.write( "Sarah has <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+3+ ALIGN=MIDDLE  ALT=\"+s+=+3+\"   DISABLED_style= \"max-width:90%; height:auto;\" > brothers </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );