document.write( "Question 1089721: If the sum of two no. is 57 and difference is 20. What are the possible pairs.
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Algebra.Com's Answer #704075 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "x + y = 57.\r\n" );
document.write( "x - y = 20.\r\n" );
document.write( "-----------------Add the two equations. You will get\r\n" );
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document.write( "2x = 57 + 20 = 77.   Hence,  x =   = 38.5.\r\n" );
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document.write( "Then from the first equation,  y = 57 - 37.5 = 18.5.\r\n" );
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document.write( "Two possible pairs are (38.5,18.5)  and  (18.5,38.5).\r\n" );
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