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GMAT prep: Fraction

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Intern
Intern
avatar
Joined: 06 Jan 2009
Posts: 11

Kudos [?]: 53 [0], given: 0

GMAT prep: Fraction [#permalink]

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New post 31 Jan 2009, 03:15
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Last edited by ongste on 31 Jan 2009, 03:40, edited 1 time in total.

Kudos [?]: 53 [0], given: 0

Manager
Manager
User avatar
Joined: 05 Jul 2008
Posts: 136

Kudos [?]: 122 [0], given: 40

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

Kudos [?]: 122 [0], given: 40

Intern
Intern
avatar
Joined: 06 Jan 2009
Posts: 11

Kudos [?]: 53 [0], given: 0

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

Kudos [?]: 53 [0], given: 0

Manager
Manager
User avatar
Joined: 05 Jul 2008
Posts: 136

Kudos [?]: 122 [0], given: 40

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:

Kudos [?]: 122 [0], given: 40

Senior Manager
Senior Manager
avatar
Joined: 30 Nov 2008
Posts: 485

Kudos [?]: 347 [0], given: 15

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) ?

Kudos [?]: 347 [0], given: 15

Re: GMAT prep: Fraction   [#permalink] 31 Jan 2009, 10:10
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GMAT prep: Fraction

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