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

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

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24 Oct 2009, 19:55
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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?
[Reveal] Spoiler: OA

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Re: Percentage Problem, Word Translation Issue [#permalink]

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24 Oct 2009, 20:01
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$$30*24-12*24/12*24=30-12/12=18/12$$
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On average, the bottle-nosed dolphin comes up for air once [#permalink]

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24 Oct 2009, 20:07
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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
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Re: Percentage Problem, Word Translation Issue [#permalink]

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25 Oct 2009, 01:10
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!).
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26 Aug 2011, 05:39
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?
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26 Aug 2011, 08:52
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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!
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On average, the bottle-nosed dolphin comes up for air once [#permalink]

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17 Apr 2012, 09:04
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.
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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17 Apr 2012, 11:04
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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.
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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17 Apr 2012, 11:23
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.

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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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01 Aug 2012, 14:04
Is this really a 600 - 700 question ? not sub 600 ?
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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12 Aug 2013, 02:45
Bumped for review and further discussion.
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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12 Aug 2013, 08:03
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%
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Last edited by Asifpirlo on 14 Aug 2013, 11:36, edited 1 time in total.
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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14 Aug 2013, 10:39
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 ?
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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14 Aug 2013, 11:33
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
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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29 Dec 2013, 06:50
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!
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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08 Jan 2015, 14:24
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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02 Feb 2016, 02:25
Hello from the GMAT Club BumpBot!

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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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01 Apr 2016, 08:29
Please change difficulty level of this question to 600 or 500.
Thank you.
Bunuel 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%

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

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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]

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01 Apr 2016, 09:27
nktdotgupta wrote:
Please change difficulty level of this question to 600 or 500.
Thank you.
Bunuel 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%

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

The difficulty level is calculated automatically based on users sessions.
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Re: On average, the bottle-nosed dolphin comes up for air once   [#permalink] 01 Apr 2016, 09:27
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