Is xy divisible by 6 ?

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sumanr84: Legendary Member; Posts: 758; Joined: Sat Aug 29, 2009 9:32 pmFollowed by: 2 members; Location: Bangalore,India; Thanked: 67 times

by sumanr84 » Wed Jan 27, 2010 9:32 am

If w, x and y are different positive integers, and wxy = 24, is xy divisible by 6?

(1) wy is not divisible by 6.

(2) x is even.

set your timer and try solving within 1 min first..

source : www.magoosh.com

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Source: Beat The GMAT — Data Sufficiency | Wed Jan 27, 2010 9:32 am

dmitriyaleyev: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Thu May 21, 2009 5:53 pm; Thanked: 1 times

by dmitriyaleyev » Wed Jan 27, 2010 9:46 am

e ???

1. clearly ins as it doesn't address x
2. is a multiple of 2, but we don't know if necessary 3
1+2. we know xy has 2 but again know nothing about 3

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ajith: Legendary Member; Posts: 1275; Joined: Thu Sep 21, 2006 11:13 pmFollowed by: 2 members; Location: Arabian Sea; Thanked: 125 times

by ajith » Wed Jan 27, 2010 9:52 am

sumanr84 wrote:If w, x and y are different positive integers, and wxy = 24, is xy divisible by 6?

(1) wy is not divisible by 6.

(2) x is even.

set your timer and try solving within 1 min first..

source : www.magoosh.com

1 is not sufficient
2 is not sufficient

1&2 together also is not sufficient

{wy = 3 x=8, example}

Always borrow money from a pessimist, he doesn't expect to be paid back.

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tanviet: Legendary Member; Posts: 1404; Joined: Tue May 20, 2008 6:55 pmFollowed by: 2 members; Thanked: 18 times

by tanviet » Thu Jan 28, 2010 3:05 am

I do not study this hard

we factor the 24=2.2.2.3

for deviding problem, alway factor into primes

E is correct

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