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

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If 500 is the multiple of 100 that is closest to x and 400 [#permalink]

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New post 26 Dec 2008, 06:59
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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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Re: Multiple - GMATprep [#permalink]

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New post 26 Dec 2008, 23:04
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.

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Re: Multiple - GMATprep [#permalink]

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New post 27 Dec 2008, 09:39
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.

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Re: Multiple - GMATprep [#permalink]

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New post 15 Jan 2009, 07:26
Can someone please explain this question? I, too, am confused in understanding the question. Thanlks.

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Re: Multiple - GMATprep [#permalink]

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New post 15 Jan 2009, 07:56
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?

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Re: Multiple - GMATprep   [#permalink] 15 Jan 2009, 07:56
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