Gmat prep Test 2-- Each of the numbers w,x,y,z

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khurram: Master | Next Rank: 500 Posts; Posts: 231; Joined: Mon Jan 07, 2008 9:39 amFollowed by: 1 member; Thanked: 4 times

by khurram » Mon May 26, 2008 9:09 pm

I am assuming that in each one you see how the fractions come to 11/16 for first one and 31/81. One of the w,x,y,z will be zero to get the answer.

Am I thinking right.
Khurram

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Source: Beat The GMAT — Problem Solving | Mon May 26, 2008 9:09 pm

ksh: Master | Next Rank: 500 Posts; Posts: 106; Joined: Sun Feb 17, 2008 10:09 pm; Thanked: 3 times

by ksh » Mon May 26, 2008 11:25 pm

stem1. (8w+4x+2y+z)/16=11/16
so, (8w+4x+2y+z)=11 which can be possible when w,y,z each are 1 and x=0 so, Suff
Similarly,
stem2. (27w+9x+3y+z)=31,which can be possible when w,y,z each are 1 and x=0 so, Suff

hence D

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khurram: Master | Next Rank: 500 Posts; Posts: 231; Joined: Mon Jan 07, 2008 9:39 amFollowed by: 1 member; Thanked: 4 times

by khurram » Tue May 27, 2008 6:09 am

Thanks
That is how I did it.
Thanks
khurram

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