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GRE Math Challenge #75-What percent of the integers

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GRE Math Challenge #75-What percent of the integers [#permalink] New post 03 May 2015, 01:32
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Question Stats:

100% (02:10) correct 0% (00:00) wrong based on 1 sessions
What percent of the integers between 200 and 999, inclusive, end with the digits “03”?

(A) 1%
(B) 25
(C) 3%
(D) 4%
(E) 5%
[Reveal] Spoiler: OA

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Re: GRE Math Challenge #75-What percent of the integers [#permalink] New post 07 Aug 2017, 08:20
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sandy wrote:
What percent of the integers between 200 and 999, inclusive, end with the digits “03”?

(A) 1%
(B) 25
(C) 3%
(D) 4%
(E) 5%


A nice rule says: the number of integers from x to y inclusive equals y - x + 1
So, the number of integers from 200 to 999 inclusive = 999 - 200 + 1 = 800

How many of those 800 integers end in "03"?
Well, we can quickly list them: 203, 303, 403, 503, 603, 703, 803, 903
There are 8 integers that end in "03"

8/800 = 1/100 = 1%

Answer:
[Reveal] Spoiler:
A


Cheers,
Brent
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Re: GRE Math Challenge #75-What percent of the integers   [#permalink] 07 Aug 2017, 08:20
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GRE Math Challenge #75-What percent of the integers

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