document.write( "Question 237340: Please help me understand how to solve the following problem? \r
\n" ); document.write( "\n" ); document.write( "Three tired and hungry people had a big bag of apples. While the other two were asleep, one of the three awoke, ate one-third of the apples, and went back to sleep. Later a second person awoke, ate one-third of the remaining apples and went back to sleep. Finally, the third person awoke and ate one-third of the remaining apples, leaving 8 apples in the bag. How many apples were in the bag originally?
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Algebra.Com's Answer #174541 by rapaljer(4671)\"\" \"About 
You can put this solution on YOUR website!
Let x = original number of apples in the bag \r
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\n" ); document.write( "\n" ); document.write( "x-1/3x= 2/3x = number of apples left after the first person \r
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\n" ); document.write( "\n" ); document.write( "The second person ate 1/3 of those that were left, so
\n" ); document.write( "1/3*2/3x= 2/9x apples = number of apples eaten by the second person.\r
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\n" ); document.write( "\n" ); document.write( "This leaves (2/3)x-(2/9)x which is (6/9)x - (2/9)x or 4/9x apples left after the second person.\r
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\n" ); document.write( "\n" ); document.write( "The third person ate 1/3 of the 4/9x apples, which is 4/27x apples.\r
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\n" ); document.write( "\n" ); document.write( "This leaves (4/9)x-(4/27)x apples after the third person, which is
\n" ); document.write( "(12/27)x-(4/27)x or (8/27)x.\r
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\n" ); document.write( "\n" ); document.write( "So the equation is, based upon the number of apples left being equal to 8: \r
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\n" ); document.write( "\n" ); document.write( "\"%288%2F27%29x=8\"\r
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\n" ); document.write( "\n" ); document.write( "Multiply both sides of the equation by the reciprocal of (8/27) which is (27/8), and you have\r
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\n" ); document.write( "\n" ); document.write( "\"%2827%2F8%29%2A%288%2F27%29x=+%2827%2F8%29%2A8\"
\n" ); document.write( "x= 27 apples.\r
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\n" ); document.write( "\n" ); document.write( "Check:\r
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\n" ); document.write( "\n" ); document.write( "The first person eats 1/3 of 27 which is 9 apples, leaving 18 apples.\r
\n" ); document.write( "\n" ); document.write( "The second person eats 1/3 of 18 which is 6 apples, leaving 12.\r
\n" ); document.write( "\n" ); document.write( "The third person eats 1/3 of 12 which is 4 apples, leaving 8 apples.\r
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\n" ); document.write( "\n" ); document.write( "VERY NICE PROBLEM!!!\r
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\n" ); document.write( "\n" ); document.write( "Dr. Robert J. Rapalje, Retired
\n" ); document.write( "Seminole State College of Florida
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