An epidemic is reported to have broken out in Florida : GMAT Problem Solving (PS)
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# An epidemic is reported to have broken out in Florida

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An epidemic is reported to have broken out in Florida [#permalink]

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21 Nov 2012, 06:21
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73% (02:30) correct 27% (02:08) wrong based on 158 sessions

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An epidemic is reported to have broken out in Florida. The number of detected instances of a certain disease is reported to have increased by 85% in the last year. What is the lowest number of newly detected instances possible?

(A) 1

(B) 5

(C) 11

(D) 15

(E) 17

[Reveal] Spoiler:
We need to find the MINIMUM possible no. of instances that a disease has been detected (at the present) if it the no. has increased by 85% from the last year (the no. of detected instances of the disease) ..
[Reveal] Spoiler: OA

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Last edited by vomhorizon on 21 Nov 2012, 07:24, edited 1 time in total.
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Re: An epidemic is reported to have broken out in Florida [#permalink]

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21 Nov 2012, 09:58
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vomhorizon wrote:
An epidemic is reported to have broken out in Florida. The number of detected instances of a certain disease is reported to have increased by 85% in the last year. What is the lowest number of newly detected instances possible?

(A) 1

(B) 5

(C) 11

(D) 15

(E) 17

Last year, there were n instances of the disease.
This year, the instances have increased by 85% i.e. this year, there are (n + 85% of n) instances of the disease.
The number of newly detected instances = 85% of n

Now the question is: What is the lowest number of newly detected instances possible?
This means we need to find the minimum value of 85% of n.

What are the constraints because of which there must be a minimum value of 85% of n?
The number of cases detected last year and the number of newly detected cases must be an integer. You cannot detect half a case, right?

Can (85/100 * n) be 1? No because in that case, n will not be an integer.
Can (85/100 * n) be 5? No because in that case, n will not be an integer.

Notice that 85 = 5*17.
So 85/100 = 17/20

(17/20 * n) = 17
n = 20 (an integer)

We will not get n as integer in any of the other options.
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Re: An epidemic is reported to have broken out in Florida [#permalink]

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27 Apr 2016, 12:01
1
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The number should be a possible factor of 85 so choices C and D are out
out of other possible choices it says that number of patients detected increased 85 %
if we take 1 for plugging in then the number obtained before increase is not a integer same is the case with 5
so correct option - E
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Re: An epidemic is reported to have broken out in Florida [#permalink]

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26 Jan 2014, 23:50
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Re: An epidemic is reported to have broken out in Florida [#permalink]

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25 Mar 2015, 04:01
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: An epidemic is reported to have broken out in Florida [#permalink]

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25 Mar 2016, 19:55
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: An epidemic is reported to have broken out in Florida   [#permalink] 25 Mar 2016, 19:55
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