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Gmat prep math...

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saafiin
 Post subject: Gmat prep math...
 Post Posted: Mon Nov 21, 2011 12:04 am 
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Posts: 7
Q: Each of the numbers w,x,y and z has a value of either 0 or 1. Then what is the value of 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

a) 1 alone sufficient
b) 2 alone sufficient
c) Both together sufficient
d) Each alone sufficient
e) Neither of the two sufficient


Need help in solving this out.. tried but couldn't reach to the end.
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thanghnvn
 Post subject: Re: Gmat prep math...
 Post Posted: Tue Nov 22, 2011 6:18 am 
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Posts: 206
from 1 we have
8w+4x+2y+z=11
there is only one case
w=1, y=1, z=1, x=0
similar 2,

D
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RonPurewal
 Post subject: Re: Gmat prep math...
 Post Posted: Wed Nov 23, 2011 6:56 am 
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ManhattanGMAT Staff


Posts: 7146
per forum rules, please search the forum for existing threads on each problem. if you continue to post brand-new threads on problems for which threads already exist, we will have to start deleting them, in order to prevent diluting the search responses.
thanks.

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