document.write( "Question 1124086: William is 1/6 as old as his father but 5 years older than his sister Mary. If the sum of all their ages is 51, how old is William
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Algebra.Com's Answer #740457 by ikleyn(52794) $\"\"$ $\"About$

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document.write( "William + Father + Mary  = 51.\r\n" );
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document.write( "W       + 6W     + (W-5) = 51     (<<<---=== Father = 6*William;  Mary = William -5)\r\n" );
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document.write( "8W = 51 + 5 = 56  ====>  W = 56/8 = 7.\r\n" );
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document.write( "Answer.  William is 7 years old;  the father is 6*7 = 42 years old;  Mary is 7-5 = 2 years.\r\n" );
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document.write( "Check.   7 + 42 + 2 = 51.   ! Correct !\r\n" );
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