document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=151380>Question 151380</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Six years ago bob was four times as old as Mary. In four years he will be twice as old as Mary. How old are they?\r<BR>\n" );
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document.write( "Six years ago<BR>\n" );
document.write( "Bob = 4Mary - 6\r<BR>\n" );
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document.write( "In four years<BR>\n" );
document.write( "Bob = 2Mary + 4\r<BR>\n" );
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document.write( "4M - 6 = 2M + 4<BR>\n" );
document.write( "2M = 10<BR>\n" );
document.write( "Mary = 5 years old\r<BR>\n" );
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document.write( "Substitute both equations with 5, and Bob is 14\r<BR>\n" );
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document.write( "I just want to know if that is right or wrong? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #111272 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=111272\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Six years ago bob was four times as old as Mary. <BR>\n" );
document.write( "In four years he will be twice as old as Mary. <BR>\n" );
document.write( "How old are they? <BR>\n" );
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document.write( "Let Mary's age now be \"m\".<BR>\n" );
document.write( "Let Bob's age now be \"b\".<BR>\n" );
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document.write( "6 yrs. ago equation:<BR>\n" );
document.write( "(b-6) = 4(m-6)<BR>\n" );
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document.write( "4 yrs. from now equation:<BR>\n" );
document.write( "b = 2m<BR>\n" );
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document.write( "Substitute to solve for \"m\".<BR>\n" );
document.write( "(2m-6) = 4(m-6)<BR>\n" );
document.write( "2m-6 = 4m-24<BR>\n" );
document.write( "2m = 18<BR>\n" );
document.write( "m = 9 yrs old (Mary's age now)<BR>\n" );
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document.write( "Since b = 2m, b = 2*9 = 18 yrs old (Bob's age now)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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