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If the population of a certain country increases at the rate

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If the population of a certain country increases at the rate  [#permalink]

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New post 09 Jun 2014, 06:45
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GMAT weekly questions


If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 20 minutes?

A. 80
B. 100
C. 150
D. 240
E. 300

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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 09 Jun 2014, 06:46
Bunuel wrote:

GMAT weekly questions


If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 20 minutes?

A. 80
B. 100
C. 150
D. 240
E. 300


Since the population increases at the rate of 1 person every 15 seconds, it increases by 4 people every 60 seconds, that is, by 4 people every minute. Thus, in 20 minutes the population increases by 20 x 4 = 80 people.

Answer. A.
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 09 Jun 2014, 16:51
Bunuel,
Do you really think such easy questions appears in the exam?
I believe GMAT posts very simple weekly questions.
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New post 10 Jun 2014, 01:07
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 30 Sep 2014, 01:11
Answer = 4 * 20 = 80

Answer = A
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 26 Oct 2014, 02:14
1 min = 15*4 sec
for 20 minutes, its 4*20 = 80. Answer is A
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 15 Jan 2015, 03:21
I basically used the RTW chart and converted 15 sec to 0.25 minutes. I then divided 20 by 0.25, resulting in 80.
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 25 Oct 2015, 13:54
This is actually a GMAT question. :)
4 clones every minute. 20 minutes -> 80 new clones :)
the empire will strike back :D
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 25 Oct 2015, 14:52
mvictor wrote:
This is actually a GMAT question. :)
4 clones every minute. 20 minutes -> 80 new clones :)
the empire will strike back :D


A possibility as all the questions in Official Guides/GMATPREP free or exam pack 1 or question pack 1 are officially retired questions from actual GMAT exams.
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 15 May 2016, 00:56
Increase of 1 person per 15 seconds is equivalent to a increase of 4 person/minute
So in 20 minutes increase = 20 * 4 = 80 persons
correct answer - A
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 05 Jul 2016, 05:24
1
Bunuel wrote:

GMAT weekly questions


If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 20 minutes?

A. 80
B. 100
C. 150
D. 240
E. 300



try not to make it complicated
15s= 1


20*60=1200s

15 =>1

1200 => ?

1200*1 / 15 =80
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Re: If the population of a certain country increases at the rate  [#permalink]

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New post 16 Jul 2017, 17:36
Quote:
If the population of a certain country increases at the rate of one person every 15 seconds, by how many persons does the population increase in 20 minutes?

A. 80
B. 100
C. 150
D. 240
E. 300


We are given that a population increases by 1 person every 15 seconds and we need to determine how many people it will increase by in 20 minutes, which is 20 x 60 = 1200 seconds. We can let x = the number of people increased in 20 minutes and create the following proportion:

1/15 = x/1200

15x = 1200

x = 80

Alternate Solution:

One person every 15 seconds equals 4 people per minute. Thus, in 20 minutes, we have 4 x 20 = 80 people.

Answer: A
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Re: If the population of a certain country increases at the rate  [#permalink]

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