document.write( "Question 1069228: THE PRESENT AVERAGE AGE OF A MAN AND HIS TWIN SON IS 30 YEARS. THE RATIO OF THE AGES OF THE MAN AND ONE OF HIS SONS IS 5:2 . PRESENT AGE OF THE MAN IS? \n" ); document.write( "

Algebra.Com's Answer #684422 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "The equations are\r\n" );
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document.write( "M + 2S = 90,     (1)   (\"THE PRESENT AVERAGE AGE OF A MAN AND HIS TWIN SON IS 30 YEARS\" is the same as to say M + 2S = 90)\r\n" );
document.write( "M/S = 5/2        (2)\r\n" );
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document.write( "Equivalently\r\n" );
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document.write( "M + 2S = 90,\r\n" );
document.write( "M = .\r\n" );
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document.write( "--->   = 90  --->  5S + 4S = 180  --->  9S = 90  --->  S = 20  --->  M =  = 50.\r\n" );
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document.write( "Answer.  Man is 50 years now. The sons (the twins) are 20 years old each.\r\n" );
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