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GMAT prep: Fraction

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Intern
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Joined: 06 Jan 2009
Posts: 10
GMAT prep: Fraction  [#permalink]

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New post Updated on: 31 Jan 2009, 03:40
Hi everyone,

The question is a little bit hard to read..

((1001^2) - (999^2)) / ((101^2) - (99^2))

a) 10
b) 20
c) 40
d) 80
e) 100

What is a shortcut way of answering this question?

Thanks

--== Message from GMAT Club Team ==--

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Originally posted by ongste on 31 Jan 2009, 03:15.
Last edited by ongste on 31 Jan 2009, 03:40, edited 1 time in total.
Manager
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Joined: 05 Jul 2008
Posts: 131
GMAT 2: 740 Q51 V38
Re: GMAT prep: Fraction  [#permalink]

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New post 31 Jan 2009, 03:31
ongste wrote:
Hi everyone,

The question is a little bit hard to read..

((1000^2) - (999^2)) / ((101^2) - (99^2))

a) 10
b) 20
c) 40
d) 80
e) 100

What is a shortcut way of answering this question?

Thanks

=(1000-999)(1000+999)/[(101-99)(101+99)
=1999/[2*2000]

:shock: :o
Intern
Intern
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Joined: 06 Jan 2009
Posts: 10
Re: GMAT prep: Fraction  [#permalink]

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New post 31 Jan 2009, 03:39
:oops: :lol:

Sorry, made a typing mistake.

I figured the question out immediately after posting it..

(x^2) - (y^2) = (x+y)(x-y)

Thanks for your help :-D
Manager
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Joined: 05 Jul 2008
Posts: 131
GMAT 2: 740 Q51 V38
Re: GMAT prep: Fraction  [#permalink]

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New post 31 Jan 2009, 06:17
ongste wrote:
:oops: :lol:

Sorry, made a typing mistake.

I figured the question out immediately after posting it..

(x^2) - (y^2) = (x+y)(x-y)

Thanks for your help :-D

You're welcome :wink:
Senior Manager
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Joined: 30 Nov 2008
Posts: 479
Schools: Fuqua
Re: GMAT prep: Fraction  [#permalink]

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New post 31 Jan 2009, 10:10
DavidArchuleta wrote:
ongste wrote:
Hi everyone,

The question is a little bit hard to read..

((1000^2) - (999^2)) / ((101^2) - (99^2))

a) 10
b) 20
c) 40
d) 80
e) 100

What is a shortcut way of answering this question?

Thanks

=(1000-999)(1000+999)/[(101-99)(101+99)
=1999/[2*2000]

:shock: :o


Shouldn't this be (1001 + 999) (1001 - 999) / (101 + 99) (101 - 99) ?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: GMAT prep: Fraction &nbs [#permalink] 31 Jan 2009, 10:10
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