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beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Sat Jan 31, 2009 3:14 pm

If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?
A. 5
B. 5(x – y)
C. 20x
D. 20y
E. 35x

Source: Beat The GMAT — Problem Solving | Sat Jan 31, 2009 3:14 pm

logitech: Legendary Member; Posts: 2134; Joined: Mon Oct 20, 2008 11:26 pm; Thanked: 237 times; Followed by:25 members; GMAT Score:730

by logitech » Sat Jan 31, 2009 3:26 pm

35X/20X = 7/4 not an integer. Choose (C)

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