document.write( "Question 1108522: John is 4 years older than his sister Mary. Together, their ages add up to 30. How old is Mary\r
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Algebra.Com's Answer #723514 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "J - M =  4,\r\n" );
document.write( "J + M = 30.\r\n" );
document.write( "------------------To solve the system, add the two equations.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Answer. J = 17, M = 13.\r
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