document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=969848>Question 969848</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hannah has three sisters. The average age of her three sisters is 25. One sister is 26 years old and another is 21 years old.\r<BR>\n" );
document.write( "\n" );
document.write( "How old is Hannah's other sister? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #592584 by </B><A HREF=/tutors/aboutme.mpl?userid=erica65404><B>erica65404(394)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=erica65404><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=erica65404><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=592584\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> average equals the sum of the values divided by the number of values.<BR>\n" );
document.write( "This equal can be looked at as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=s%2Fn ALIGN=MIDDLE  ALT=\"a=s%2Fn\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "where a is average, s is sum, and n is the number of values.<BR>\n" );
document.write( "For example there are 3 sisters. that means 3 age values so n will be 3.<BR>\n" );
document.write( "The average age of the sisters is 25, that is a.<BR>\n" );
document.write( "and the sum of the sisters ages is 26 + 21 + x where x is the unknown age of the third sister.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=+s%2Fn ALIGN=MIDDLE  ALT=\"a=+s%2Fn\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25=%2826%2B21%2Bx%29%2F3 ALIGN=MIDDLE  ALT=\"25=%2826%2B21%2Bx%29%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "solve for x<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25=%2847%2Bx%29%2F3 ALIGN=MIDDLE  ALT=\"25=%2847%2Bx%29%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=75=47%2Bx ALIGN=MIDDLE  ALT=\"75=47%2Bx\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=28=x ALIGN=MIDDLE  ALT=\"28=x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The third sisters age is 28. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );