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Is wp+st>0?

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Math Revolution GMAT Instructor
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GPA: 3.82
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Is wp+st>0? [#permalink]

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New post 21 Mar 2017, 02:48
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (01:11) correct 31% (01:10) wrong based on 72 sessions

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Is wp+st>0?

1) ws+pt>0
2) wt+ps>0
[Reveal] Spoiler: OA

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Kudos [?]: 3037 [0], given: 0

Expert Post
Math Revolution GMAT Instructor
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Joined: 16 Aug 2015
Posts: 4318

Kudos [?]: 3037 [0], given: 0

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Premium Member CAT Tests
Re: Is wp+st>0? [#permalink]

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New post 23 Mar 2017, 01:21
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==> In the original condition, there are 4 variables (w,p,s,t) and in order to match the number of variables to the number of equations, there must be 4 equations. Since there is 1 for con 1) and 1 for con 2), E is most likely to be the answer. By solving con 1) and con 2), you get (w,s,p,t)=(1,1,1,1) yes, but (w,s,p,t)=(3,-1,-4,-1) no, hence it is not sufficient.

Therefore, the answer is E.
Answer: E
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Is wp+st>0? [#permalink]

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New post 16 Sep 2017, 06:54
Similar question posted
https://gmatclub.com/forum/is-uv-st-249412.html

But OA is C

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Joined: 12 Feb 2017
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Kudos [?]: 21 [0], given: 40

Re: Is wp+st>0? [#permalink]

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New post 16 Sep 2017, 07:15
akshata19 wrote:
Similar question posted
https://gmatclub.com/forum/is-uv-st-249412.html

But OA is C


It can not be C.
1) ws+pt>0
clearly Insufficient.

2)wt+ps>0
clearly Insufficient.

Now add these two inequalities
ws+pt+wt+ps>0
ws+wt + pt+ps >0
w(s+t) + p(s+t)>0
(w+p)(s+t)>0

still nothing is clear. Hence statements 1 and 2 together are not sufficient.

Hence Answer is E.

Kudos if it helps.

Kudos [?]: 21 [0], given: 40

Re: Is wp+st>0?   [#permalink] 16 Sep 2017, 07:15
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