document.write( "Question 1150570: today the father is 51 years and his son is 9 years . In how many years the father will be four times as old as his son? \n" ); document.write( "

Algebra.Com's Answer #771945 by ikleyn(52794) $\"\"$ $\"About$

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document.write( "51 + x = 4*(x+9)\r\n" );
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document.write( "51 + x = 4x + 36\r\n" );
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document.write( "51 - 36 = 4x - x\r\n" );
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document.write( "15      = 3x\r\n" );
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document.write( "x       = 15/3 = 5.\r\n" );
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document.write( "ANSWER.  In 5 years.\r\n" );
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