Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

 It is currently 17 Jul 2019, 01:55

### 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

# On average, the bottle-nosed dolphin comes up for air once

Author Message
TAGS:

### Hide Tags

Intern
Joined: 18 Oct 2009
Posts: 48
Schools: Kellogg
On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

24 Oct 2009, 20:55
2
1
12
00:00

Difficulty:

45% (medium)

Question Stats:

65% (02:03) correct 35% (01:59) wrong based on 970 sessions

### HideShow timer Statistics

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%

One question I have is how to interpret a statement like the following: "X's height is 110% greater than that of Y." Does that mean X = 1.10*Y or X = 2.10*Y?

_________________
GMAT Strategies: http://gmatclub.com/forum/slingfox-s-gmat-strategies-condensed-96483.html
Math Expert
Joined: 02 Sep 2009
Posts: 56266
On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

24 Oct 2009, 21:07
10
9
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%

Dolphin once in 2 min;
Beluga once in 5 min;
So, dolphin comes up 2.5 times frequently than beluga, which is 150% (5-2)/2*100.

"X's height is 110% greater than that of Y."
Means: x=(1+110%)*y=(1+1.1)*y=2.1*y
_________________
Manager
Status: Quant 50+?
Joined: 02 Feb 2011
Posts: 93
Concentration: Strategy, Finance
Schools: Tuck '16, Darden '16

### Show Tags

26 Aug 2011, 09:52
7
1
enigma123 wrote:
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?

1.50%
2.100%
3.150%
4.200%
5. 250%

I got 250%. But that's incorrect. The correct answer is c [150%]. Can someone help please?

Key wording is percent greater. 5/2 = 2.5 = 250%, but the dolphin obviously comes up 100% of itself, thus we have to subtract the 100%.

Consider this. I scored 500 on my gmat, you scored 600. What percent greater did you score? Answer is 20%, however if I said "your score is what percent of my score?" the answer would be 120%.

Be careful!
##### General Discussion
Senior Manager
Joined: 18 Aug 2009
Posts: 267
Re: Percentage Problem, Word Translation Issue  [#permalink]

### Show Tags

24 Oct 2009, 21:01
4
1
$$30*24-12*24/12*24=30-12/12=18/12$$
Intern
Joined: 18 Oct 2009
Posts: 48
Schools: Kellogg
Re: Percentage Problem, Word Translation Issue  [#permalink]

### Show Tags

25 Oct 2009, 02:10
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!).
_________________
GMAT Strategies: http://gmatclub.com/forum/slingfox-s-gmat-strategies-condensed-96483.html
Manager
Joined: 12 Oct 2011
Posts: 106
GMAT 1: 700 Q48 V37
GMAT 2: 720 Q48 V40
On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

17 Apr 2012, 10:04
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.
Manager
Joined: 19 Mar 2012
Posts: 147
Location: United States
Concentration: Finance, General Management
GMAT 1: 750 Q50 V42
GPA: 3.69
WE: Analyst (Mutual Funds and Brokerage)
Re: On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

17 Apr 2012, 12:04
1
BN1989 wrote:
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.
Senior Manager
Joined: 10 Jul 2013
Posts: 306
Re: On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

Updated on: 14 Aug 2013, 12:36
slingfox wrote:
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%

One question I have is how to interpret a statement like the following: "X's height is 110% greater than that of Y." Does that mean X = 1.10*Y or X = 2.10*Y?

.
solution:
(30×24 - 12×24)/ (12×24) × 100 % = 150%
_________________
Asif vai.....

Originally posted by Asifpirlo on 12 Aug 2013, 09:03.
Last edited by Asifpirlo on 14 Aug 2013, 12:36, edited 1 time in total.
Intern
Joined: 20 Mar 2013
Posts: 4
Re: On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

14 Aug 2013, 11:39
Asifpirlo wrote:
slingfox wrote:
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%

One question I have is how to interpret a statement like the following: "X's height is 110% greater than that of Y." Does that mean X = 1.10*Y or X = 2.10*Y?

.
solution:
(30×24 - 18×24)/ (18×24) × 100 % = 150%

If Beluga comes up once every 5 mins, then it comes up 12 times in an hour rite. So it should be 12*24 instead of 18*24 isn't it ?
Senior Manager
Joined: 10 Jul 2013
Posts: 306
Re: On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

14 Aug 2013, 12:33
Diipz wrote:
Asifpirlo wrote:
slingfox wrote:
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%

One question I have is how to interpret a statement like the following: "X's height is 110% greater than that of Y." Does that mean X = 1.10*Y or X = 2.10*Y?

.
solution:
(30×24 - 18×24)/ (18×24) × 100 % = 150%

If Beluga comes up once every 5 mins, then it comes up 12 times in an hour rite. So it should be 12*24 instead of 18*24 isn't it ?

yes brother... just typing mistake................. it should be 12
_________________
Asif vai.....
SVP
Joined: 06 Sep 2013
Posts: 1649
Concentration: Finance
Re: On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

29 Dec 2013, 07:50
slingfox wrote:
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%

One question I have is how to interpret a statement like the following: "X's height is 110% greater than that of Y." Does that mean X = 1.10*Y or X = 2.10*Y?

This is pretty straightforward

BD every 2 min
BW every 5 min

So in one hour
BD 30 times
BW 12 times

We are asked for percentage, in 24 hours it will show the same ratio so no need to calculate that actually, let's stick with 1 hour

18/12 = 1.5 = 150%

Hope it helps
Cheers!
J
Non-Human User
Joined: 09 Sep 2013
Posts: 11667
Re: On average, the bottle-nosed dolphin comes up for air once  [#permalink]

### Show Tags

06 Aug 2018, 00:15
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: On average, the bottle-nosed dolphin comes up for air once   [#permalink] 06 Aug 2018, 00:15
Display posts from previous: Sort by