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# In a certain population, there are 3 times as many people ag

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Senior Manager
Joined: 19 Nov 2009
Posts: 320
In a certain population, there are 3 times as many people ag [#permalink]

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05 May 2010, 13:56
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Difficulty:

5% (low)

Question Stats:

77% (01:36) correct 23% (00:31) wrong based on 171 sessions

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In a certain population, there are 3 times as many people aged twenty-one or under as there are people over twenty-one. The ratio of those twenty-one or under to the total population is

(A) 1 to 2
(B) 1 to 3
(C) 1 to 4
(D) 2 to 3
(E) 3 to 4
[Reveal] Spoiler: OA

Last edited by Bunuel on 26 Feb 2014, 01:16, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
Manager
Joined: 02 Aug 2009
Posts: 111
Re: population ratio - ETS Paper Test [#permalink]

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05 May 2010, 14:25
2
KUDOS
just plug in #s

say there are 6 people aged under 21. Thus there will be 2 people over 21 so a total of 8 people. And we are asked what proportion under 21 (6) is to total (8)

6/8=3/4 =E

Additionally same exact approach 3X/3X+1X = 3/4
Manager
Joined: 23 Sep 2009
Posts: 146
Re: population ratio - ETS Paper Test [#permalink]

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05 May 2010, 22:28
Consider the ratio of the under population of 21 to over the 21 as 3:1
therefore 3x:1X
Now the ratio of the under to the whole population becomes 3x/3x+1x
= 3/4

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VP

Senior Manager
Joined: 19 Nov 2009
Posts: 320
Re: population ratio - ETS Paper Test [#permalink]

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06 May 2010, 11:20
thanks for the explanation !

This was a simple one... but i messed it up and got the answer as "1 to 4"
Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 327
Re: population ratio - ETS Paper Test [#permalink]

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19 May 2010, 20:43
is there a section for avoiding stupid mistakes ...i wrote down 1:1 ....completely forgot that it was thrice ..
Manager
Joined: 22 Aug 2013
Posts: 110
Schools: ISB '15
Re: population ratio - ETS Paper Test [#permalink]

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25 Feb 2014, 22:07
1
KUDOS
Hi,
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Veritas Prep - 650
MGMAT 1 590
MGMAT 2 640 (V48/Q31)

Math Expert
Joined: 02 Sep 2009
Posts: 39662
Re: population ratio - ETS Paper Test [#permalink]

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26 Feb 2014, 01:18
seabhi wrote:
Hi,

_____________________
Done.
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Posts: 15956
Re: In a certain population, there are 3 times as many people ag [#permalink]

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21 Nov 2016, 23:01
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: In a certain population, there are 3 times as many people ag   [#permalink] 21 Nov 2016, 23:01
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