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Is xy greater than 1? x and y are both positive.

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Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42338

Kudos [?]: 133141 [0], given: 12415

Is xy greater than 1? x and y are both positive. [#permalink]

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New post 17 Oct 2017, 23:51
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

85% (00:36) correct 15% (00:25) wrong based on 53 sessions

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Kudos [?]: 133141 [0], given: 12415

Manager
Manager
User avatar
S
Joined: 05 Dec 2016
Posts: 232

Kudos [?]: 25 [0], given: 48

Concentration: Strategy, Finance
GMAT 1: 620 Q46 V29
GMAT ToolKit User
Re: Is xy greater than 1? x and y are both positive. [#permalink]

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New post 18 Oct 2017, 02:42
(1) no info about y
(2) no info about x
(1) + (2)
case 1:
x=5/9
y=9
x*y=5 greater than 1 ===> Answer is YES
case 2:
x=1/9
y=9
x*y=1 equal to 1 ===> Answer is NO

Answer E.

Kudos [?]: 25 [0], given: 48

Manager
Manager
User avatar
B
Joined: 09 Aug 2017
Posts: 59

Kudos [?]: 8 [0], given: 18

Location: United States
Concentration: Technology
GMAT 1: 640 Q44 V33
GMAT 2: 630 Q47 V29
WE: Research (Investment Banking)
CAT Tests
Re: Is xy greater than 1? x and y are both positive. [#permalink]

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New post 23 Oct 2017, 18:33
I went with E.
St1 only gives us info on x, still need y.
St2, only gives us info on y, still need x.
Given statement 1 and 2, x could be 1/100000000 and y could be 1.5. Conversely, x could be .75 and Y could be 100. One would give a yes, the other would give a no.
_________________

I'd love to hear any feedback or ways to improve my problem solving. I make a lot of silly mistakes. If you've had luck improving on stupid mistakes, I'd love to hear how you did it.

Also, I appreciate any kudos.

Kudos [?]: 8 [0], given: 18

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B
Joined: 29 Oct 2016
Posts: 9

Kudos [?]: [0], given: 29

Schools: ISB '19, Rotman '20
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Re: Is xy greater than 1? x and y are both positive. [#permalink]

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New post 23 Oct 2017, 21:55
(1) x is less than 1.
(2) y is greater than 1.

1. Take x =0.5 and y=1 then xy < 1, Take x =0.5 and y=3 then xy > 1, So we get one Yes and one No
Insufficient
2. Take x =0.2 and y=3 then xy < 1, Take x =0.5 and y=3 then xy > 1, So we get one Yes and one No
Insufficient
1 + 2
Same we get one Yes and One No
Insufficient

So Ans E

Kudos [?]: [0], given: 29

Re: Is xy greater than 1? x and y are both positive.   [#permalink] 23 Oct 2017, 21:55
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Is xy greater than 1? x and y are both positive.

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