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Gmat prep

by gettin there » Fri Sep 26, 2008 10:28 am
At a certain pet shop, 1/3 of the pets are dogs, and 1/5 of the pets are birds. How many pets are dogs?

1.There are 30 birds at the pet shop.
2.There are 20 more dogs than birds at the pet shop.


Can anyone assist. I think I overlooked a step.

Thanks
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Source: — Data Sufficiency |
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by kuroneko1313 » Fri Sep 26, 2008 10:35 am
Statement 1: There are 30 birds. So from here we get that the total of the pets in the whole shop is 30 x 5 = 150 pets. From here we know the total number of the dogs which is 150:3 = 50.
(Sufficient)

Statement 2: We can express it to be something like:
x/3 = x/5 + 20
Carry this out, we also get x=150, and again we can find the number of dogs from here.
(Sufficient)

So I think it is D, what's the OA?
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Correct

by gettin there » Fri Sep 26, 2008 10:41 am
The OA is D
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thanks

by gettin there » Fri Sep 26, 2008 10:50 am
Sorry, got lost in the second part. can you explain!
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Re: thanks

by stop@800 » Sat Sep 27, 2008 3:54 am
gettin there wrote:Sorry, got lost in the second part. can you explain!
dogs - birds = 20
(TotalPets / 3) - (TotalPets / 5) = 20
TotalPets * 2 / 15 = 20
TotalPets = 150

now you can find dogs / birds
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Where did the 5 come from?

by pierce22884 » Sat Sep 27, 2008 5:15 pm
kuroneko1313 wrote:Statement 1: There are 30 birds. So from here we get that the total of the pets in the whole shop is 30 x 5 = 150 pets. From here we know the total number of the dogs which is 150:3 = 50.
(Sufficient) /quote]

Where did the 5 come from? Sorry don't really understand... Please explain.
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Re: Where did the 5 come from?

by stop@800 » Sun Sep 28, 2008 5:49 am
pierce22884 wrote:
kuroneko1313 wrote:Statement 1: There are 30 birds. So from here we get that the total of the pets in the whole shop is 30 x 5 = 150 pets. From here we know the total number of the dogs which is 150:3 = 50.
(Sufficient) /quote]

Where did the 5 come from? Sorry don't really understand... Please explain.
From Question stem:
it says "1/3 of the pets are dogs, and 1/5 of the pets are birds"

Please correct me if I understood your point wrong
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by plentyofwill » Fri Dec 03, 2010 11:21 am
Pierce the ratio of birds in the pet shop is 1/5. That means if you have 30 birds you need to multiply by 5 to get the number of pets in the shop. Once you get the number of pets in the shop which is 150 (30 x 5), you then can figure out how many dogs because we know the number of dogs are 1/3 of the number of pets in the shop.
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