document.write( "Question 1129907: When I am as old as sue is now, sue will be 4 years older than I am now. How much older is sue than I? Please if you can explain how you got it because I'm having a hard time with it and I would like to understand. Thank you! \n" ); document.write( "

Algebra.Com's Answer #746553 by ikleyn(52787) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "When I am as old as sue is now, sue will be 4 years older than I am now.
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\n" ); document.write( "\n" ); document.write( " The solution by the other tutor is TOTALLY WRONG, so I came to fix it.\r
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\n" ); document.write( "\n" ); document.write( " Below find my correct solution.\r
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document.write( "Let y = your age now.\r\n" );
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document.write( "Let s = Sue's age now.\r\n" );
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document.write( "Let d = s - y,     (*)  the difference between Sue's age and your age.\r\n" );
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document.write( "\"When I am as old as sue is now, \"     (- It will happen in d years from now, and Sue will be (s + d) years old then)\r\n" );
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document.write( "sue will be 4 years older than I am now.\r\n" );
document.write( "s + d = y + 4     (**)           <<<---===  The other tutor missed \"+ d\" in the left side of this equation,\r\n" );
document.write( "                                            therefore all his further conclusions are wrong\r\n" );
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document.write( "From (**),  s - y = 4 - d = (substitute here d= s - y   from (*)) = 4 - (s-y).\r\n" );
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document.write( "Thus you have  s- y = 4 - (s-y).\r\n" );
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document.write( "Collect the terms  \"(s-y)\" on the left side:\r\n" );
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document.write( "2*(s-y) = 4,   \r\n" );
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document.write( "hence,  s-y = 2,\r\n" );
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document.write( "which means that Sue is 2 years older than you.     ANSWER\r\n" );
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