document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=91211>Question 91211</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Erin’s age is 3 times Warren’s. in 4 years she will be twice as old as he will be. How old is each? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #66203 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=66203\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Start by assigning variables the the unknown quantities.<BR>\n" );
document.write( "Let E = Erin's present age.<BR>\n" );
document.write( "Let W = Warren's present age.<BR>\n" );
document.write( "Erin's age (E)is (=) three times Warren's (3W), so you can write:<BR>\n" );
document.write( "1) E = 3W<BR>\n" );
document.write( "In four years, Erin's age (E+4) will be (=) twice Warren's (2(W+4)), so you can write:<BR>\n" );
document.write( "2) E+4 = 2(W+4) Substitute from equation 1) E = 3W and solve for W.<BR>\n" );
document.write( "3W+4 = 2(W+4)  Simplify.<BR>\n" );
document.write( "3W+4 = 2W+8 Subtract 2W from both sides.<BR>\n" );
document.write( "W+4 = 8 Subtract 4 from both sides.<BR>\n" );
document.write( "W = 4 This is Warren's present age.<BR>\n" );
document.write( "E = 3W<BR>\n" );
document.write( "E = 3(4)<BR>\n" );
document.write( "E = 12  This is Erin's present age.\r<BR>\n" );
document.write( "\n" );
document.write( "Check:<BR>\n" );
document.write( "E+4 = 2(W+4)<BR>\n" );
document.write( "12+4 = 2(4+4)<BR>\n" );
document.write( "16 = 2(8)<BR>\n" );
document.write( "16 = 16  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );