Gmat prep math...

[saafiin]

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.

[thanghnvn]

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

[RonPurewal]

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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