OG 12 DS MULTIPLE OF 105

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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pmFollowed by: 5 members; Thanked: 33 times

by pradeepkaushal9518 » Tue Jun 29, 2010 7:33 am

IS POSITIVE INTEGER X IS A MULTIPLE OF 6 AND POSITIVE INTEGER Y IS A MULTIPLE OF 14, IS XY A MULTIPLE OF 105?

1. X IS A MULTIPLE OF 9.
2. Y IS A MULTIPLE OF 25

PLZ EXPLAIN

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Source: Beat The GMAT — Data Sufficiency | Tue Jun 29, 2010 7:33 am

Rich@VeritasPrep: GMAT Instructor; Posts: 147; Joined: Tue Aug 25, 2009 7:57 pmFollowed by: 17 members; Location: New York City; Thanked: 76 times; GMAT Score:770

by Rich@VeritasPrep » Tue Jun 29, 2010 7:43 am

Check out this post I wrote about just this problem

:

https://www.bschooladmissionsformula.com ... -the-gmat/

Rich Zwelling
GMAT Instructor, Veritas Prep

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Tue Jun 29, 2010 7:48 am

IMO B

the prime factors of x are 2,3

the prime factors of y are 2,7

the prime factors of 105 are 3,5,7

All these prime factors should be the factor of XY.Only 5 is missing in XY.

Stmt 2 tell us that 5 is the factor of y.

Hence B

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