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Important math..

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saafiin
 Post subject: Important math..
 Post Posted: Mon Nov 21, 2011 9:04 pm 
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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.

Answer is D
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tim
 Post subject: Re: Important math..
 Post Posted: Wed Nov 23, 2011 2:15 pm 
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ManhattanGMAT Staff


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Location: Southwest Airlines, seat 21C
How far did you get on this question, and what part(s) of the solution didn’t make sense to you? For that matter, where did this problem come from?

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Tim Sanders
Manhattan GMAT Instructor
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