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Unable to understand OG explanations for mentioned DS problems

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Intern
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Unable to understand OG explanations for mentioned DS problems [#permalink]

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New post 07 Aug 2017, 03:41
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Hi all,

I was solving DS problems from OG and was unable to understand the explanation given in the guide for the below 2 questions:

Q 84. If x, y, and z are positive numbers, is x>y>z ?
1) xz > yz
2) yx > yz

(The anwer given is E i.e. Both statements not sufficient)
If we solve both statements we'll get x>y and x>z respectively.But we can also see that xz >yx as xz and yx are both >yz. So woudn't this count for something?

Q 85. K is a set of numbers such that
(i) if x is in K, then −x is in K, and
(ii) if each of x and y is in K, then xy is in K.

Is 12 in K?
(1) 2 is in K.
(2) 3 is in K.

(The answer given is C i.e. Both statements together sufficient)
Somebody please explain.

Kudos [?]: 0 [0], given: 12

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Intern
Intern
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B
Joined: 16 Aug 2016
Posts: 6

Kudos [?]: 7 [1], given: 28

Location: India
GMAT 1: 460 Q35 V19
GPA: 3.6
WE: Brand Management (Retail)
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Re: Unable to understand OG explanations for mentioned DS problems [#permalink]

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New post 07 Aug 2017, 08:39
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Hi, kindly find the solutions (and discussions) to these problems in below links:-

Q84 - https://gmatclub.com/forum/if-x-y-and-z ... 29241.html
Q85 - https://gmatclub.com/forum/k-is-a-set-o ... 96907.html

hope the solutions and discussions will help mitigating the doubts :)

Regards,
Pulkit

Kudos [?]: 7 [1], given: 28

Re: Unable to understand OG explanations for mentioned DS problems   [#permalink] 07 Aug 2017, 08:39
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Unable to understand OG explanations for mentioned DS problems

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