GMATPrep Test 1 #2_PS #2

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kwah: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Wed Jan 04, 2012 5:15 pm

by kwah » Sun Mar 11, 2012 8:20 pm

What is the most efficient way to achieve the result for the question attached?

Answer: E

Thanks,
K

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Source: Beat The GMAT — Quantitative Reasoning | Sun Mar 11, 2012 8:20 pm

Jim@StratusPrep: MBA Admissions Consultant; Posts: 2279; Joined: Fri Nov 11, 2011 7:51 amFollowed by: 266 members; Location: New York; Thanked: 660 times; GMAT Score:770

by Jim@StratusPrep » Mon Mar 12, 2012 7:13 pm

simplify first to this:

xy +z = xy + xz

then

z = xz

when is this true?

both sides will be 0 if z = 0 or

both sides will be z if x = 1

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