document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=764374>Question 764374</A>: <I><SPAN STYLE=\"word-break: break-all;\"> tony  is 21 years older than his sister. in 10 years he will be twice as old as his sister.  how old is each of them  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #465409 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=465409\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> tony is 21 years older than his sister. in 10 years he will be twice as old as his sister. how old is each of them <BR>\n" );
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document.write( "Equations:<BR>\n" );
document.write( "t = s + 21<BR>\n" );
document.write( "t+10 = 2(s+10)<BR>\n" );
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document.write( "Substitute for \"t\" and solve for \"s\":<BR>\n" );
document.write( "s+21+10 = 2s+20<BR>\n" );
document.write( "s + 31 = 2s + 20<BR>\n" );
document.write( "s = 11 (sister's age now)<BR>\n" );
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document.write( "Solve for \"t\":<BR>\n" );
document.write( "t = s + 21<BR>\n" );
document.write( "t = 32 (tony's age now)<BR>\n" );
document.write( "===================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=============== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );