Last visit was: 14 Jul 2024, 10:16 It is currently 14 Jul 2024, 10:16
Toolkit
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

# If the population of a certain country increases at the rate of one

SORT BY:
Tags:
Show Tags
Hide Tags
Math Expert
Joined: 02 Sep 2009
Posts: 94342
Own Kudos [?]: 640749 [12]
Given Kudos: 85011
Math Expert
Joined: 02 Sep 2009
Posts: 94342
Own Kudos [?]: 640749 [2]
Given Kudos: 85011
Intern
Joined: 19 Jan 2008
Posts: 11
Own Kudos [?]: 12 [0]
Given Kudos: 4
Math Expert
Joined: 02 Sep 2009
Posts: 94342
Own Kudos [?]: 640749 [0]
Given Kudos: 85011
Re: If the population of a certain country increases at the rate of one [#permalink]
ankushbassi wrote:
Bunuel,
Do you really think such easy questions appears in the exam?
I believe GMAT posts very simple weekly questions.

Yes, this question is very easy but one can still encounter 1 or 2 such easy questions on the test.
SVP
Joined: 27 Dec 2012
Status:The Best Or Nothing
Posts: 1558
Own Kudos [?]: 7291 [0]
Given Kudos: 193
Location: India
Concentration: General Management, Technology
WE:Information Technology (Computer Software)
Re: If the population of a certain country increases at the rate of one [#permalink]
Answer = 4 * 20 = 80

Intern
Joined: 25 Oct 2014
Posts: 5
Own Kudos [?]: 11 [0]
Given Kudos: 5
Location: United States
Concentration: Marketing, Healthcare
GMAT Date: 12-17-2014
GPA: 3.7
Re: If the population of a certain country increases at the rate of one [#permalink]
1 min = 15*4 sec
for 20 minutes, its 4*20 = 80. Answer is A
Senior Manager
Joined: 07 Apr 2014
Status:Math is psycho-logical
Posts: 335
Own Kudos [?]: 393 [1]
Given Kudos: 169
Location: Netherlands
GMAT Date: 02-11-2015
WE:Psychology and Counseling (Other)
Re: If the population of a certain country increases at the rate of one [#permalink]
1
Bookmarks
I basically used the RTW chart and converted 15 sec to 0.25 minutes. I then divided 20 by 0.25, resulting in 80.
Board of Directors
Joined: 17 Jul 2014
Posts: 2146
Own Kudos [?]: 1189 [1]
Given Kudos: 236
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
GPA: 3.92
WE:General Management (Transportation)
Re: If the population of a certain country increases at the rate of one [#permalink]
1
Kudos
This is actually a GMAT question.
4 clones every minute. 20 minutes -> 80 new clones
the empire will strike back :D
SVP
Joined: 20 Mar 2014
Posts: 2359
Own Kudos [?]: 3649 [0]
Given Kudos: 816
Concentration: Finance, Strategy
GMAT 1: 750 Q49 V44
GPA: 3.7
WE:Engineering (Aerospace and Defense)
Re: If the population of a certain country increases at the rate of one [#permalink]
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.
Senior Manager
Joined: 24 Nov 2015
Posts: 405
Own Kudos [?]: 125 [0]
Given Kudos: 231
Location: United States (LA)
Re: If the population of a certain country increases at the rate of one [#permalink]
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
Intern
Joined: 20 Oct 2015
Posts: 29
Own Kudos [?]: 5 [1]
Given Kudos: 8
Re: If the population of a certain country increases at the rate of one [#permalink]
1
Kudos
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
Target Test Prep Representative
Joined: 14 Oct 2015
Status:Founder & CEO
Affiliations: Target Test Prep
Posts: 19130
Own Kudos [?]: 22629 [0]
Given Kudos: 286
Location: United States (CA)
Re: If the population of a certain country increases at the rate of one [#permalink]
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.

e-GMAT Representative
Joined: 04 Jan 2015
Posts: 3712
Own Kudos [?]: 17312 [0]
Given Kudos: 165
Re: If the population of a certain country increases at the rate of one [#permalink]

Solution

Given
• The population of a certain country increases at the rate of one person every 15 seconds
To find
• How many persons does the population increase in 20 minutes?
Approach and Working out
• Population increased in 15 sec= 1
• Population increased in 60 sec or 1 min= 1*4 = 4
o Population increased in 20 min= 4*20 = 80

Thus, option A is the correct answer.

Senior Manager
Joined: 02 Jan 2022
Posts: 258
Own Kudos [?]: 100 [0]
Given Kudos: 3
GMAT 1: 760 Q50 V42
Re: If the population of a certain country increases at the rate of one [#permalink]
Total seconds in 20 minutes = 20*60 = 1200

Since the rate of increase is 1 person per 15 seconds,

In 1200 seconds, the total increase will be 1200/15 = 80

Thus, the correct answer is A.
Non-Human User
Joined: 09 Sep 2013
Posts: 33966
Own Kudos [?]: 851 [0]
Given Kudos: 0
Re: If the population of a certain country increases at the rate of one [#permalink]
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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: If the population of a certain country increases at the rate of one [#permalink]
Moderator:
Math Expert
94342 posts