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How many odd integers are greater than integer x and less

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SVP
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Joined: 21 Jul 2006
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How many odd integers are greater than integer x and less [#permalink] New post 22 Jul 2008, 05:27
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How many odd integers are greater than integer x and less than integer y?

(1) There are 12 even integers greater than x and less than y.

(2) There are 24 integers greater than x and less than y




show your explanations please.
thanks
Senior Manager
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Joined: 06 Apr 2008
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Re: Looks simple, yet is tricky [#permalink] New post 22 Jul 2008, 06:03
tarek99 wrote:
How many odd integers are greater than integer x and less than integer y?

(1) There are 12 even integers greater than x and less than y.

(2) There are 24 integers greater than x and less than y




show your explanations please.
thanks


B)

Between 24 and 50 there are 12 even integers and 13 odd integers. Between 24 and 49 there are 12 even and 12 odd integers so statement 1) is insufficient

Between 25 and 50 there are 24 integers and 12 odd integers. Similarly between 26 and 51 there are 24 integers and 12 odd integers. Therefore statement 2) is sufficient
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Re: Looks simple, yet is tricky [#permalink] New post 22 Jul 2008, 09:15
let do this using a smaller number than 12

A)
between 2 and 6 , there is one even integer, but 2 odd integers
between 3 and 7, there are two even integers, but 1 odd integer

therefore A not suff

B) once u know there an even number of integers between the numbres, half of htem have to be odd -> suff
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Re: Looks simple, yet is tricky [#permalink] New post 22 Jul 2008, 11:35
OA is B, thanks guys!
Re: Looks simple, yet is tricky   [#permalink] 22 Jul 2008, 11:35
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How many odd integers are greater than integer x and less

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