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# Is z divisible by 168 ? a) z is divisible by 14 b) z is

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Manager
Joined: 28 May 2009
Posts: 155
Location: United States
Concentration: Strategy, General Management
GMAT Date: 03-22-2013
GPA: 3.57
WE: Information Technology (Consulting)
Followers: 4

Kudos [?]: 117 [0], given: 91

Is z divisible by 168 ? a) z is divisible by 14 b) z is [#permalink]  23 Jun 2009, 18:39
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Is $$z$$ divisible by $$168$$?

a) $$z$$ is divisible by $$14$$
b) $$z$$ is divisible by $$12$$
_________________
Manager
Joined: 30 May 2009
Posts: 218
Followers: 3

Kudos [?]: 66 [0], given: 0

Re: DS: Medium on D&P [#permalink]  23 Jun 2009, 18:49

1. Z is divisible by 14. INSUFF. IF z = 14, then z is not divisible by 168. But if z=168, then z is divisible by 168.
2. Z is divisible by 12. INSUFF. IF z = 12, then z is not divisible by 168. But if z=168, then z is divisible by 168.

Combine (1) and (2). If z=84, then it is divisible by both 14 and 12, but not divisible by 168.
But If z=168, then it is divisble by both 14 and 12, and also divisible by 168.

Hence Cannot say.
Manager
Joined: 28 Jan 2004
Posts: 203
Location: India
Followers: 2

Kudos [?]: 14 [0], given: 4

Re: DS: Medium on D&P [#permalink]  23 Jun 2009, 19:18
Stmt 1. Insuff. as 14 is not divisible by 168.
Stmt 2. Insuff. as 14 is not divisible by 168.

Combine, first of all determine wha is the smallest number which is divisible by 12 and 14 both.If it comes out to be less then 168 hen clearly i will not be divisible by 168.
Least number divisible by 12 and 14 = LCM of 12 and 14 = 84.
It is not divisible by 168.
Now try to find atleast 1 number which is divible by 12 & 14 as well as by 168.
In this case i is 168 itself.

So we have a two contradictory scenarious. Hence insuff.

E
Senior Manager
Joined: 23 Jun 2009
Posts: 355
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Followers: 5

Kudos [?]: 96 [0], given: 63

Re: DS: Medium on D&P [#permalink]  23 Jun 2009, 21:51
LCS of 12 and 14 is 84. So they are not sufficient together.
Manager
Joined: 28 May 2009
Posts: 155
Location: United States
Concentration: Strategy, General Management
GMAT Date: 03-22-2013
GPA: 3.57
WE: Information Technology (Consulting)
Followers: 4

Kudos [?]: 117 [0], given: 91

Re: DS: Medium on D&P [#permalink]  24 Jun 2009, 07:48
Correct. The OA is E.
_________________
Re: DS: Medium on D&P   [#permalink] 24 Jun 2009, 07:48
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