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cuty: Senior | Next Rank: 100 Posts; Posts: 30; Joined: Sun Feb 27, 2011 1:51 am

by cuty » Mon Mar 07, 2011 6:26 am

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 | Mon Mar 07, 2011 6:26 am

kevincanspain: GMAT Instructor; Posts: 613; Joined: Thu Mar 22, 2007 6:17 am; Location: madrid; Thanked: 171 times; Followed by:64 members; GMAT Score:790

by kevincanspain » Mon Mar 07, 2011 7:02 am

C looks supicious, since 35x/20x =4/7 not an integer

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