document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=166073>Question 166073</A>: <I><SPAN STYLE=\"word-break: break-all;\"> question 1)  A sailboat travels 20 miles downstream in 3 hours.  It returns in 4 hours.  Find the speed of the sailboat in still water and the rate of the current.\r<BR>\n" );
document.write( "\n" );
document.write( "question 2) 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 now. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #122420 by </B><A HREF=/tutors/aboutme.mpl?userid=midwood_trail><B>midwood_trail(310)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=midwood_trail><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=122420\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I will do question only.\r<BR>\n" );
document.write( "\n" );
document.write( "(2) 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 now.\r<BR>\n" );
document.write( "\n" );
document.write( "I will do question (2) first.\r<BR>\n" );
document.write( "\n" );
document.write( "Warren's age now is x.\r<BR>\n" );
document.write( "\n" );
document.write( "Erin's age now is 3x.\r<BR>\n" );
document.write( "\n" );
document.write( "In 4 years, they both will be 4 years older, right?\r<BR>\n" );
document.write( "\n" );
document.write( "3x + 4 = Erin's age 4 years form now.\r<BR>\n" );
document.write( "\n" );
document.write( "x + 4 = Warren's age 4 years from now.\r<BR>\n" );
document.write( "\n" );
document.write( "3x + 4 = 2(x + 4)\r<BR>\n" );
document.write( "\n" );
document.write( "3x + 4 = 2x + 8\r<BR>\n" );
document.write( "\n" );
document.write( "3x - 2x = 8 - 4\r<BR>\n" );
document.write( "\n" );
document.write( "x = 4\r<BR>\n" );
document.write( "\n" );
document.write( "Warren is 4 years old now.\r<BR>\n" );
document.write( "\n" );
document.write( "Erin is 3(4) years old now or 12 years old.\r<BR>\n" );
document.write( "\n" );
document.write( "Did you follow?\r<BR>\n" );
document.write( "\n" );
document.write( "For question (1), you are dealing with two equations in two variables.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );