document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=378904>Question 378904</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The square of Janes age 6 years ago is equal to her age in six years time.  Find her present age?\r<BR>\n" );
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document.write( "Thank you. </SPAN>\n" );
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document.write( "let Jane's age now be X<BR>\n" );
document.write( "Jane's age 6years ago =X -6<BR>\n" );
document.write( "Jane's age in 6years time = X  +6<BR>\n" );
document.write( "(X -6)^2 = X  +6<BR>\n" );
document.write( "(X-6)(X-6)=X  +6<BR>\n" );
document.write( "X^2 -6X-6X  +36X= X  +6<BR>\n" );
document.write( "X^2 -12X  +36X-X-6=0<BR>\n" );
document.write( "X^2-11X  +30=0<BR>\n" );
document.write( "the roots are -6 and -5<BR>\n" );
document.write( "X^2-6X-5X  +30=0<BR>\n" );
document.write( "X(X -6)-5(X-6)=0<BR>\n" );
document.write( "(X-6)(X-5)=0<BR>\n" );
document.write( "X=6 or X=5<BR>\n" );
document.write( "since both answers are positive and they satisfy our equation, we take them both <BR>\n" );
document.write( "so jane's present age is 5years or 6Years old </SPAN>\n" );
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