divisor of 2 r and 2 s

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Thu May 06, 2010 5:42 am

If 3 is the greatest common divisor of positive integers r and s, what is the greatest common divisor of 2 r and 2 s?
(A) 2
(B) 3
(C) 4
(D) 6
(E) 8

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Source: Beat The GMAT — Problem Solving | Thu May 06, 2010 5:42 am

liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Thu May 06, 2010 5:59 am

it should be 2*3=6

Ans option D

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