document.write( "Question 1195826: Tommy is three years older than Jack. Sadie is seven less than twice Jack’s age. Sadie and Tommy are twins. How old is jack \n" ); document.write( "

Algebra.Com's Answer #828386 by ikleyn(52782) $\"\"$ $\"About$

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\n" ); document.write( "Tommy is three years older than Jack. Sadie is seven less than twice Jack’s age.
\n" ); document.write( "Sadie and Tommy are twins. How old is jack
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document.write( "Write equations as you read the problem\r\n" );
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document.write( "    T = J + 3,      (1)\r\n" );
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document.write( "    S = 2J - 7,     (2)\r\n" );
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document.write( "    S = J.          (3)\r\n" );
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document.write( "Equation (3) implies\r\n" );
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document.write( "    J + 3 = 2J - 7,\r\n" );
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document.write( "or\r\n" );
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document.write( "    3 + 7 = 2J - J\r\n" );
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document.write( "      10  =    J\r\n" );
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document.write( "ANSWER.  Jack is 10 years old.\r\n" );
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