document.write( "Question 1183973: A man is 7 times as old as his son. In 5 years he will be 4 times as old as his son.how old is the father? \n" ); document.write( "

Algebra.Com's Answer #814486 by ikleyn(52786) $\"\"$ $\"About$

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\n" ); document.write( "A man is 7 times as old as his son. In 5 years he will be 4 times as old as his son.how old is the father?
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document.write( "x  = son's age\r\n" );
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document.write( "7x = father's age\r\n" );
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document.write( "In 5 years\r\n" );
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document.write( "    7x + 5 = 4*(x+5).\r\n" );
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document.write( "Simplify and solve\r\n" );
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document.write( "    7x + 5 = 4x + 20\r\n" );
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document.write( "    7x - 4x = 20 - 5\r\n" );
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document.write( "       3x   =    15\r\n" );
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document.write( "        x   = 15/3 = 5 years (the son's age).\r\n" );
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document.write( "ANSWER.  The father is 7*5 = 35 years old.\r\n" );
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