GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video
close
It is currently 19 May 2022, 20:22
Register
GMAT Club Tests
Decision Tracker
My Rewards
New posts
New comers' posts

Close

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
Your Progress

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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
At the moment there are 54,210 tagged birds in a certain wildlife
9 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
Tags:
Find Similar Topics 

Show Tags
Hide Tags

avatar
shrive555
Manager
Manager
Joined: 15 Sep 2010
Status:Do and Die!!
Posts: 223
At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  26 Oct 2010, 21:49
1
Kudos
10
Bookmarks
Quiz Dashboard Attempt only this question Same topic and source Same topic and difficulty Same source and difficulty Random Chronological Reverse chronological Learn more
00:00
A
B
C
D
E

Difficulty:

55% (hard)

Question Stats:

60% (02:12) correct 40% (02:44) wrong based on 126 sessions

Hide Show timer Statistics

At the moment there are 54,210 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?

25
30
33 1/3
37 1/2
50
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.

_________________
I'm the Dumbest of All !!
Signature Read More
Quiz Dashboard Attempt only this question Same topic and source Same topic and difficulty Same source and difficulty Random Chronological Reverse chronological Learn more
Most Helpful Expert Reply
User avatar
V
KarishmaB
GMAT Expert
Joined: 16 Oct 2010
Posts: 12900
Location: Pune, India
Top Member of the Month
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  27 Oct 2010, 18:46
20
Kudos
4
Bookmarks
Expert Reply
Most percentage questions can be easily solved by assuming values, especially in case the answer is also a percentage.
If there are 100 birds, 20% are tagged so 20 are tagged.
Out of the rest 80, 30 should be tagged so that a total of 50% are tagged.
30/80 = 37.5%

(The huge number given is superfluous, just to make you waste your precious time. Read the question again to realize that it is not needed.)
_________________
Karishma
Owner of Angles and Arguments
https://anglesandarguments.com/

For Individual GMAT Study Modules, check Study Modules >
For Private Tutoring, check Private Tutoring >
Signature Read More
General Discussion
avatar
Ellipse
Manager
Manager
Joined: 16 Oct 2010
Posts: 66
Location: United States
Concentration: Finance, Entrepreneurship
Schools: INSEAD Jan '13, Kellogg 1YR '15, Sloan '16, IE '15
GMAT 1: 700 Q49 V35
WE:Information Technology (Investment Banking)
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  26 Oct 2010, 22:14
shrive555 wrote:
At the moment there are 54,210 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?

25
30
33 1/3
37 1/2
50


All birds = 54210
Currently Tagged = 54210 * 20/100 = 10842
So Untagged birds = 54210 - 10842 = 43368

Half of all birds = 27105
The number of birds to be tagged to make half of all birds tagged = 27105 - 10842 = 16263
So now the question remains - 16263 is how much percentage of untagged birds (43368)
= 16263 * 100 /43368
= 37.5 %
Answer (D)
avatar
shrive555
Manager
Manager
Joined: 15 Sep 2010
Status:Do and Die!!
Posts: 223
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  27 Oct 2010, 14:57
lengthy calculation ...
_________________
I'm the Dumbest of All !!
Signature Read More
avatar
krushna
Intern
Intern
Joined: 30 Sep 2010
Posts: 42
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  27 Oct 2010, 15:21
1
Kudos
let x% of remaining birds will be tagged to increase the tagged percentage from 20 to 50

so x% * 80%= 30% hence x = 30 * 5/4 = 37.5
User avatar
AtifS
Manager
Manager
Joined: 20 Jan 2010
Status:Not afraid of failures, disappointments, and falls.
Posts: 234
Concentration: Technology, Entrepreneurship
Schools: Haas '19, Darden '19, INSEAD Jan '19, Stanford '19, Anderson '19, HBS '19
WE:Operations (Telecommunications)
GMAT ToolKit User
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  31 Oct 2010, 04:10
Thank you! Karishma for such an easy solution & the tip :)
User avatar
Sarang
Manager
Manager
Joined: 01 Nov 2010
Posts: 89
Location: Zürich, Switzerland
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  09 Nov 2010, 09:30
Best answer Karishma!!!
avatar
aalriy
Manager
Manager
Joined: 04 Mar 2009
Status:Preparing Apps
Posts: 83
Concentration: Marketing, Strategy
Schools: Johnson '15 (S), Kelley '15 (D), Darden '15 (D), Kenan-Flagler '15 (D), Cox '15 (A$), McCombs '15 (D)
GMAT 1: 650 Q48 V31
GMAT 2: 710 Q49 V38
WE:Information Technology (Consulting)
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  09 Dec 2010, 23:09
I approached this question as follows:

you have 20% birds tagged and to have 50% birds tagged you need to tag 30% more birds. The question is asking you how much is 30% of the the Currently untagged birds(i.e. 80%)?

So the question is what is (30/80)*100. ~ 40 and the closest option is D.

I totally agree with Karishma that the huge number is superflous and even i did waste my 30 sec on it.
avatar
B
jhagege
Intern
Intern
Joined: 22 Nov 2020
Posts: 3
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink] New post  17 Mar 2021, 08:11
VeritasKarishma wrote:
Most percentage questions can be easily solved by assuming values, especially in case the answer is also a percentage.
If there are 100 birds, 20% are tagged so 20 are tagged.
Out of the rest 80, 30 should be tagged so that a total of 50% are tagged.
30/80 = 37.5%

(The huge number given is superfluous, just to make you waste your precious time. Read the question again to realize that it is not needed.)


Thanks, this is a clear explanation.
I noticed you often recommend the "weighted average" / alligation method.
Is it a case where we could have used it as well ?
When is it preferable to go percentage way vs alligation ?
GMAT Club Bot
gmatclubot
Re: At the moment there are 54,210 tagged birds in a certain wildlife [#permalink]
17 Mar 2021, 08:11
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderators:
chetan2u
Math Expert
10516 posts
Bunuel
Math Expert
86256 posts
generis
Senior SC Moderator
5424 posts
yashikaaggarwal
Senior Moderator - Masters Forum
2879 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions