Last visit was: 25 Apr 2026, 08:19 It is currently 25 Apr 2026, 08:19
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
slingfox
Joined: 18 Oct 2009
Last visit: 29 Dec 2010
Posts: 41
Own Kudos:
1,562
 [27]
Given Kudos: 3
Concentration: Finance
Schools:Kellogg
Posts: 41
Kudos: 1,562
 [27]
3
Kudos
Add Kudos
23
Bookmarks
Bookmark this Post
Most Helpful Reply
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 25 Apr 2026
Posts: 109,827
Own Kudos:
Given Kudos: 105,878
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,827
Kudos: 811,212
 [27]
14
Kudos
Add Kudos
13
Bookmarks
Bookmark this Post
avatar
eragotte
Joined: 02 Feb 2011
Last visit: 12 Dec 2017
Posts: 78
Own Kudos:
45
 [13]
Given Kudos: 22
Status:Quant 50+?
Concentration: Strategy, Finance
Posts: 78
Kudos: 45
 [13]
12
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
General Discussion
User avatar
hgp2k
Joined: 18 Aug 2009
Last visit: 02 Nov 2022
Posts: 192
Own Kudos:
794
 [5]
Given Kudos: 13
Posts: 192
Kudos: 794
 [5]
4
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
\(30*24-12*24/12*24=30-12/12=18/12\)
So 150%, Answer is C.
User avatar
slingfox
Joined: 18 Oct 2009
Last visit: 29 Dec 2010
Posts: 41
Own Kudos:
Given Kudos: 3
Concentration: Finance
Schools:Kellogg
Posts: 41
Kudos: 1,562
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Thanks guys. The OA is indeed C.

Thanks for the word translation help Bunuel. I just wanted to make sure I am interpreting wording correctly (I keep confusing myself unfortunately!).
User avatar
BN1989
Joined: 12 Oct 2011
Last visit: 04 Mar 2014
Posts: 97
Own Kudos:
Given Kudos: 23
GMAT 1: 700 Q48 V37
GMAT 2: 720 Q48 V40
GMAT 2: 720 Q48 V40
Posts: 97
Kudos: 918
Kudos
Add Kudos
Bookmarks
Bookmark this Post
On average, the bottle-nosed dolphin comes up for air once every two minutes; the beluga whale, a close relative, comes up for air on average once every five minutes. The number of times a bottle-nosed dolphin would come up for air in a 24 hour period is approximately what percent greater than the number of times a beluga whale would come up for air in that same period?

A) 50%
B) 100%
C) 150%
D) 200%
E) 250%

This question asks for the percentage change, but I don't see what forumulation asks that in the question? I don't see which words indicate that not the percentage of bottle-nosen dolphins to beluga whales is looked for. Could anybody help me with the formulation in these kinds of problems, I sometimes get these problems wrong because I misunderstand what's looked for in the question.
User avatar
Swoosh617
Joined: 19 Mar 2012
Last visit: 24 Aug 2015
Posts: 129
Own Kudos:
194
 [1]
Given Kudos: 13
Location: United States
Concentration: Finance, General Management
GMAT 1: 750 Q50 V42
GPA: 3.69
WE:Analyst (Mutual Funds and Brokerage)
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
BN1989
On average, the bottle-nosed dolphin comes up for air once every two minutes; the beluga whale, a close relative, comes up for air on average once every five minutes. The number of times a bottle-nosed dolphin would come up for air in a 24 hour period is approximately what percent greater than the number of times a beluga whale would come up for air in that same period?

A) 50%
B) 100%
C) 150%
D) 200%
E) 250%

This question asks for the percentage change, but I don't see what forumulation asks that in the question? I don't see which words indicate that not the percentage of bottle-nosen dolphins to beluga whales is looked for. Could anybody help me with the formulation in these kinds of problems, I sometimes get these problems wrong because I misunderstand what's looked for in the question.

These percentage questions confused me too at a point, but the formula is pretty simple: x = y(1+P) where x is your first item (number of times dolphin comes up), y is your second item (number of times whale comes up), and p is your percentage chain.

If I ever forget the formula, what I do is use the simple fact that I 3 is 50% greater than 2, or 2 is 100% greater than 1. That way I don't confuse which number goes where

3=2(1+.5)

But anyways, back to the problem: x = y(1+P)
x = once every two minutes, or 5 times every ten minutes
y = one every five minutes, or 2 times every ten minutes

5 = 2(1+P)
P = 1.5 = 150% so the answer is C.
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,984
Own Kudos:
Posts: 38,984
Kudos: 1,117
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Math Expert
109827 posts
Tuck School Moderator
852 posts