document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1203623>Question 1203623</A>: <I><SPAN STYLE=\"word-break: break-all;\"> jack is 7 years older than mia. the sum of there ages is 53.how old is jack.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #839339 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=839339\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "You have received two good formal algebraic solutions, one using two variables and the other using one.  I myself nearly always find using a single variable is easier... but it is a personal choice for each student.<br><BR>\n" );
document.write( "If formal algebra is not required, a quick mental solution can be good problem-solving exercise.<br><BR>\n" );
document.write( "The sum of their ages is 53, and one of them is 7 years older than the other.<br><BR>\n" );
document.write( "So subtract 7 from the age of the older person; that subtracts 7 from the sum of their ages.<br><BR>\n" );
document.write( "That leaves you with two people with the same age, and the sum of their ages is 63-7 = 56; so each of them is 56/2 = 28 years old.<br><BR>\n" );
document.write( "Now add the 7 years back on to the older person's age to find the two ages are 28 and 28+7 = 35.<br><BR>\n" );
document.write( "ANSWER: Jack (the older) is 35 years old<br><BR>\n" );
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