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# Is xy > 40? (1) -9 < x < 5 (2) -5 < y < 8

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Math Expert
Joined: 02 Sep 2009
Posts: 50544
Is xy > 40? (1) -9 < x < 5 (2) -5 < y < 8  [#permalink]

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07 Dec 2017, 20:21
00:00

Difficulty:

35% (medium)

Question Stats:

79% (00:58) correct 21% (00:49) wrong based on 37 sessions

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Is xy > 40?

(1) -9 < x < 5

(2) -5 < y < 8

_________________
DS Forum Moderator
Joined: 21 Aug 2013
Posts: 1365
Location: India
Re: Is xy > 40? (1) -9 < x < 5 (2) -5 < y < 8  [#permalink]

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07 Dec 2017, 22:05
1
First statement doesnt tell us anything about y, second statement doesnt tell us anything about x. So none of the statements is individually sufficient to answer the question asked. Lets combine the statements.

-9 < x < 5 and -5 < y < 8. Now we can have x=-8.9 and y=-4.9 in which case x*y > 40 but we could have x=0, in which case x*y < 40. So we cant say. Insufficient.

Re: Is xy > 40? (1) -9 < x < 5 (2) -5 < y < 8 &nbs [#permalink] 07 Dec 2017, 22:05
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