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dferm: Master | Next Rank: 500 Posts; Posts: 446; Joined: Thu Jul 26, 2007 1:07 pm; Thanked: 6 times

by dferm » Wed Apr 02, 2008 8:50 am

IF x and y are integers greater than 1, is x a multiple of y?

(1) 3y^2 + 7y = x
(2) x^2 - x is a multiple of y

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Source: Beat The GMAT — Data Sufficiency | Wed Apr 02, 2008 8:50 am

simplyjat: Master | Next Rank: 500 Posts; Posts: 423; Joined: Thu Dec 27, 2007 1:29 amFollowed by: 2 members; Location: Hyderabad, India; Thanked: 36 times; GMAT Score:770

by simplyjat » Wed Apr 02, 2008 9:55 am

Answer A

1) 3y^2 + 7y = x
y(3y+7) = x.

So X is a multple of y...

2 x^2 - x = ny
x (x - 1) = ny.
Here y is a multiple of x, but not information on x...

simplyjat

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