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Of the 2,400 animals at the zoo, 1/4 are primates. If the number of

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Of the 2,400 animals at the zoo, 1/4 are primates. If the number of [#permalink]

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New post 18 Mar 2017, 01:35
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A
B
C
D
E

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  25% (medium)

Question Stats:

72% (01:20) correct 28% (01:01) wrong based on 112 sessions

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Of the 2,400 animals at the zoo, 1/4 are primates. If the number of primates were to be reduced by 1/4 , what percent of the remaining animals would then be primates?

A. 50%
B. 33 %
C. 25%
D. 20%
E. 6.25%

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Re: Of the 2,400 animals at the zoo, 1/4 are primates. If the number of [#permalink]

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New post 18 Mar 2017, 07:34
D

1/4 of 2400 is 600. 1/4 of 600 is 150. So the total number of primates after reduction is 600-150=450 and the total number of animals is 2400-150=2250.

450/2250=0.2
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Re: Of the 2,400 animals at the zoo, 1/4 are primates. If the number of [#permalink]

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New post 19 Mar 2017, 11:25
1
Hi SajjadAhmad,

The answer choices to this question are written in such a way that you can avoid doing math altogether and just use a bit of logic to answer this question.

To start, we know that 1/4 = 25% of the animals are primates. Once we remove some of the primates, the percent of the total that will be primates will be something LESS than 25% - which means that the answer would have to be either D or E. Since we're only removing 1/4 of the primates, the drop in percent won't be gigantic, so the only answer that makes sense is...

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Re: Of the 2,400 animals at the zoo, 1/4 are primates. If the number of [#permalink]

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New post 20 Mar 2017, 02:06
1
SajjadAhmad wrote:
Of the 2,400 animals at the zoo, 1/4 are primates. If the number of primates were to be reduced by 1/4 , what percent of the remaining animals would then be primates?

A. 50%
B. 33 %
C. 25%
D. 20%
E. 6.25%


no. of primates = 1/4*2400 = 600
new no of primates after reduction = 600*3/4 = 450
total number of animals = 2400-150 = 2250

percentage = 450/2250 x 100 = 20%

option D
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Re: Of the 2,400 animals at the zoo, 1/4 are primates. If the number of [#permalink]

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New post 26 May 2018, 12:41
Of the 2,400 animals at the zoo, 1/4 are primates. If the number of primates were to be reduced by 1/4 , what percent of the remaining animals would then be primates?

2400/4 = 600 primates total

600 primates/4 = 150

Reduce the total primates by 150:
600 primates
-150 primates
450 primates left

Reduce total animals by 150:
2400 animals
- 150 primates
2250 animals left

Now find percent primates out of total animals:
450 remaining primates = 9 = 1
2250 remaining animals 45 5

1/5 = 20% --> D
Re: Of the 2,400 animals at the zoo, 1/4 are primates. If the number of   [#permalink] 26 May 2018, 12:41
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Of the 2,400 animals at the zoo, 1/4 are primates. If the number of

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