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QOTD#1 Percent of animals at Bronx Zoo

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QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 27 Jun 2016, 14:31
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Question Stats:

50% (04:15) correct 50% (05:34) wrong based on 6 sessions
Image




Approximately what percent of all the zoo’s animals are either mammals that were raised in the wild or amphibians
raised in captivity?

(A) 8
(B) 12
(C) 18
(D) 34
(E) 100

[Reveal] Spoiler: OA
B


If the Bronx Zoo donated all of its insects and fish to other zoos, approximately what percent of the animals in the
zoo would be birds raised in the wild?

(A) 5
(B) 9
(C) 24
(D) 32
(E) 60

[Reveal] Spoiler: OA
B


If the zoo currently has 80 total birds, what is the smallest number of birds that could be added such that at least
20% of the animals at the zoo would be birds?

(A) 10
(B) 80
(C) 100
(D) 125
(E) 200

[Reveal] Spoiler: OA
C





[Reveal] Spoiler: Img
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 28 Jun 2016, 01:00
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Could explain it easy way

Mitchell plans to work at a day camp over the summer. Each week, he will be paid according to the following schedule: at the end of the first week, he will receive $1. At the end of each subsequent week, he will receive $1, plus an additional amount equal to the sum of all payments he’s received in previous weeks. How much money will Mitchell be paid in total during the summer, if he works for the entire duration of the 8-week-long camp?
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 28 Jun 2016, 06:32
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sabit85BUET wrote:
Could explain it easy way

Mitchell plans to work at a day camp over the summer. Each week, he will be paid according to the following schedule: at the end of the first week, he will receive $1. At the end of each subsequent week, he will receive $1, plus an additional amount equal to the sum of all payments he’s received in previous weeks. How much money will Mitchell be paid in total during the summer, if he works for the entire duration of the 8-week-long camp?



Answer Here
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 26 Aug 2016, 00:31
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i guess the answer for last question should be B i.e 80
because 10%(birds) of total animals in zoo is given as 80 so total number of animals n zoo should be 800
20% of 800 = 160
so the least number of birds that are to be added to make 160 is 80.
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 01 Aug 2018, 04:41
Sonalika42 wrote:
i guess the answer for last question should be B i.e 80
because 10%(birds) of total animals in zoo is given as 80 so total number of animals n zoo should be 800
20% of 800 = 160
so the least number of birds that are to be added to make 160 is 80.


I got the same answer - 80 (B). Can anyone please explain why it's 100 (C)?
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 01 Aug 2018, 21:06
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The Answer for the last question in C as total number of animals after birds are added wont be 800 . If number of birds added are x , then total animals will be (800 + x) and number of bids will be (80 + x) , so (80+x)/(800+x) * 100 = 20
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 06 Aug 2018, 23:09
Can someone explain this whole thing? How do we convert percentages to numbers here?
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 07 Aug 2018, 01:41
Expert's post
What did you not get here ? your request is too dim.
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 08 Aug 2018, 11:03
Carcass wrote:
What did you not get here ? your request is too dim.


I had trouble understanding solutions for question 1 and 2
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Re: QOTD#1 Percent of animals at Bronx Zoo [#permalink] New post 11 Aug 2018, 11:14
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kruttikaaggarwal wrote:
Carcass wrote:
What did you not get here ? your request is too dim.


I had trouble understanding solutions for question 1 and 2

For both question 1 and 2, it may help to pretend there are 100 animals in the zoo (for 100%).

I'll help you with #1. Let me know if that helps you do #2.

The questions asks about mammals raised in the wild (the graph tells us that animals raised in the wild are the dotted bars, and mammals are obviously the mammal bar), and amphibians raised in captivity (striped bar of amphibians).

This is a slightly unusual bar graph, in that the striped bars don't start at the y-axis, so it might trick you into believing that, for example, 10% of all animals are birds raised in the wild. You need to check where the striped bar begins when you want to find out how many percent the bar represents.

Mammals raised in the wild is easy enough. The bar appears to stretch until roughly 6% on the x-axis, so 6% of all animals in the zoo are mammals raised in the wild.

Amphibians raised in captivity is, as I said, slightly trickier. We can easily see that the bar ends at roughly 8% on the x-axis, but we also need to check where it starts. It appears to start at roughly 2%, so the total bar has length 6%.

So 6% of the animals in the zoo are mammals raised in the wild, and 6% of the animals are amphibians raised in captivity, for a total of 12% of the animals in the zoo.

So the answer would be B.
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