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If 500 is the multiple of 100 that is closest to x and 400

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Intern
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Joined: 11 Dec 2008
Posts: 22
If 500 is the multiple of 100 that is closest to x and 400 [#permalink]

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New post 26 Dec 2008, 07:59
If 500 is the multiple of 100 that is closest to x and 400 is multiple of 100 that is closest to y, which multiple of x is closest to x+y?

(1) x < 500
(2) y < 400

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Intern
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Joined: 26 Dec 2008
Posts: 10
Schools: Thunderbird
Re: Multiple - GMATprep [#permalink]

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New post 27 Dec 2008, 00:04
E.

Two ways to solve:

1.) chunk it out mathematically:

a - min: 451 + 351 = 802
max: 449 + 449 = 948
answer set: 800, 900
INSUF

b - min: 451 + 351 = 802
max: 549 + 399 = 948
answer set: 800, 900
INSUF

a&b - min: 451 + 351 = 802
max: 499 + 399 = 898
answer set: 800, 900
INSUF

But this is way too long for the GMAT.


2.) Calculate the base:
min: 451 + 351 = 802 (or > 800)
max: 549 + 449 = 998 (or < 1000)
Answer set: 800, 900, 1000

Then look at options. You'll never take off more than 100, so you'll always be stuck with both 800 or 900 in the possible set.
Manager
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Joined: 10 Aug 2008
Posts: 72
Re: Multiple - GMATprep [#permalink]

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New post 27 Dec 2008, 10:39
pstew06 wrote:
E.

Two ways to solve:

1.) chunk it out mathematically:

a - min: 451 + 351 = 802
max: 449 + 449 = 948
answer set: 800, 900
INSUF

b - min: 451 + 351 = 802
max: 549 + 399 = 948
answer set: 800, 900
INSUF

a&b - min: 451 + 351 = 802
max: 499 + 399 = 898
answer set: 800, 900
INSUF

But this is way too long for the GMAT.


2.) Calculate the base:
min: 451 + 351 = 802 (or > 800)
max: 549 + 449 = 998 (or < 1000)
Answer set: 800, 900, 1000

Then look at options. You'll never take off more than 100, so you'll always be stuck with both 800 or 900 in the possible set.



please help me to understand the QUESTION first. Might than i will able to understand your ans.
Manager
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Joined: 12 Aug 2008
Posts: 57
Re: Multiple - GMATprep [#permalink]

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New post 15 Jan 2009, 08:26
Can someone please explain this question? I, too, am confused in understanding the question. Thanlks.
Intern
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Joined: 05 Jan 2009
Posts: 9
Re: Multiple - GMATprep [#permalink]

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New post 15 Jan 2009, 08:56
In my opinion the question should read:
If 500 is the multiple of 100 that is closest to x and 400 is multiple of 100 that is closest to y, which multiple of 100 is closest to x+y?

--== 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: Multiple - GMATprep   [#permalink] 15 Jan 2009, 08:56
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