document.write( "Question 1090309: I am 6 years older than my sister. The sum of our ages is 24 years. How old am I? \n" ); document.write( "
Algebra.Com's Answer #704749 by MathLover1(20849)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "let my age be \"x\", and the age of my sister \"y\"\r
\n" ); document.write( "\n" ); document.write( "if I am \"6\" years older than my sister, we have\r
\n" ); document.write( "\n" ); document.write( "\"x=y%2B6\".....eq.1\r
\n" ); document.write( "\n" ); document.write( "if the sum of our ages is \"24\" years, we have \r
\n" ); document.write( "\n" ); document.write( "\"x%2By=24\"..........eq.2 substitute \"x\" from eq.1\r
\n" ); document.write( "\n" ); document.write( "\"y%2B6%2By=24\"...solve for \"y\"\r
\n" ); document.write( "\n" ); document.write( "\"2y=24-6\"\r
\n" ); document.write( "\n" ); document.write( "\"2y=18\"\r
\n" ); document.write( "\n" ); document.write( "\"y=9\"-> my sister is \"9\" years old\r
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\n" ); document.write( "\n" ); document.write( "\"x=y%2B6\".....eq.1 substitute \"y\"\r
\n" ); document.write( "\n" ); document.write( "\"x=9%2B6\"\r
\n" ); document.write( "\n" ); document.write( "\"x=15\"-> I am \"15\" years old\r
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