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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]  24 Oct 2009, 20:55
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62% (02:37) correct 37% (01:11) wrong based on 2 sessions
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]  24 Oct 2009, 21:01
30*24-12*24/12*24=30-12/12=18/12
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Re: Percentage Problem, Word Translation Issue [#permalink]  24 Oct 2009, 21:07
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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]  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!).
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Dolphins [#permalink]  26 Aug 2011, 06:39
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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Re: Dolphins [#permalink]  26 Aug 2011, 09:52
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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%.

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On average, the bottle-nosed dolphin comes up for air once [#permalink]  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.
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Re: On average, the bottle-nosed dolphin comes up for air once [#permalink]  17 Apr 2012, 12:04
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]  17 Apr 2012, 12:23
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]  01 Aug 2012, 15:04
Is this really a 600 - 700 question ? not sub 600 ?
Re: On average, the bottle-nosed dolphin comes up for air once   [#permalink] 01 Aug 2012, 15:04
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