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Each of the number of w,x,y,z is equal to either 0 or 1.

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Intern
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Joined: 26 Feb 2008
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Each of the number of w,x,y,z is equal to either 0 or 1. [#permalink] New post 22 Mar 2008, 17:10
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Each of the number of w,x,y,z is equal to either 0 or 1. What is w+x+y+z?

(1) w/2 + x/4 + y/8 + z/16 = 11/16

(2) w/3 + x/9 + y/27 + z/81 = 31/81
Senior Manager
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Joined: 15 Aug 2007
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Re: DS Gmatprep [#permalink] New post 22 Mar 2008, 17:17
D

1: 8w+4x+2y+z=11 => only combination that satisfies this equation is w=1,x=0,y=1,z=1
2: same logic as above
Re: DS Gmatprep   [#permalink] 22 Mar 2008, 17:17
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Each of the number of w,x,y,z is equal to either 0 or 1.

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