document.write( "Question 1192644: Shelia's age plus Kerry's age is 27
\n" ); document.write( "Shelia's age plus jack age is 38
\n" ); document.write( "Kerry's age plus jack age is 33\r
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Algebra.Com's Answer #824532 by ikleyn(52779) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "Shelia's age plus Kerry's age is 27
\n" ); document.write( "Shelia's age plus jack age is 38
\n" ); document.write( "Kerry's age plus jack age is 33
\n" ); document.write( "How old is jack?
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document.write( "From the condition, you have these three equations \r\n" );
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document.write( "    S + K = 27    (1)\r\n" );
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document.write( "    S + J = 38    (2)\r\n" );
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document.write( "    K + J = 33    (3)\r\n" );
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document.write( "-------------------------  Add equations (1), (2) and (3).   You will get\r\n" );
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document.write( "    2S + 2K + 2J = 27 + 38 + 33\r\n" );
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document.write( "    2S + 2K + 2J =      98\r\n" );
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document.write( "Divide both sides by 2\r\n" );
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document.write( "    S + K + J = 49    (4)\r\n" );
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document.write( "To find Jack age, subtract equation (1) from equation (4).  You will get then\r\n" );
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document.write( "            J = 49 - 27\r\n" );
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document.write( "            J =   22.\r\n" );
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document.write( "ANSWER.  Jack is 22 years old.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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\n" ); document.write( "\n" ); document.write( "This problem is of very special class of problems.\r
\n" ); document.write( "\n" ); document.write( "They admit very special method of solution, which I showed you in this post.\r
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\n" ); document.write( "\n" ); document.write( "It is worth to be memorized.\r
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