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In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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27 Apr 2013, 03:45
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In GoshawkEurasian nature reserve 30 percent of the birds are Hawks, and 40 percent of the nonHawks are PaddyfieldWarblers. If there are 25 percent as many Kingfishers as PaddyfieldWarblers in the reserve, then what percent of the birds in the nature reserve are not Hawks, PaddyfieldWarblers, or Kingfishers? A. 25% B. 35% C. 45% D. 70% E. 80% P.S: Bunuel/KarishmaCan you please come up with a detail explanation for the solution. And is it a 700+ problem? I doubt although...
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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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27 Apr 2013, 04:12
I'm not Bunuel/Karishma, but I can try to help you. I don't think that it is 700+ problem. You even don't need any equations. Just be accurate with percents. Since the problem doesn't depend on the number of birds in reserve you can suppose that there are 100 birds. From them 100*0.3=30 are Hawks.So, there are 70 nonHawks. There are 0.4*70=28 PaddyfieldWarblers. Therefore, there are 0.25*28=7 Kingfishers. The total number of birds in the nature reserve that are not Hawks, PaddyfieldWarblers, or Kingfishers is 10030287=35. The answer is B. Hope this helps.
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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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27 Apr 2013, 11:15
smyarga wrote: I'm not Bunuel/Karishma, but I can try to help you. I don't think that it is 700+ problem. You even don't need any equations. Just be accurate with percents.
Since the problem doesn't depend on the number of birds in reserve you can suppose that there are 100 birds. From them 100*0.3=30 are Hawks.So, there are 70 nonHawks.
There are 0.4*70=28 PaddyfieldWarblers. Therefore, there are 0.25*28=7 Kingfishers.
The total number of birds in the nature reserve that are not Hawks, PaddyfieldWarblers, or Kingfishers is 10030287=35.
The answer is B.
Hope this helps. Thanks smyarga I was somewhat confused with my own explanation...! It's clear now..
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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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27 Apr 2013, 11:25
I'm always happy to help:)
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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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09 Sep 2013, 23:14
In GoshawkEurasian nature reserve 30 percent of the birds are Hawks, and 40 percent of the nonHawks are PaddyfieldWarblers. If there are 25 percent as many Kingfishers as PaddyfieldWarblers in the reserve, then what percent of the birds in the nature reserve are not Hawks, PaddyfieldWarblers, or Kingfishers?
A. 25% B. 35% C. 45% D. 70% E. 80%.
This question can be solved using at least 2 methods. Lets look at them. 1. We are given the following percentages: 30 (70), 40 (60), 25 (75). There are two threads from here. First starts at 30% and finishes there. Second one starts at 70, then 40, and then 25. We need a value that is divisible by 7, 2, and 5 at least once. lets pick a number now, say 700. So say if Non Hawks are 700 (this is 70% of the total, so total = 1000), then Paddy Warbs are 2/5 x 700 = 1400/5 = 280. Kingfishers, therefore, are 280/4 = 70. Lets add them up. 300 hawks + 280 Peddy Warbs + 70 kingsifhers = 650. So all others are 1000  650= 350 or 35% of total birds. The main job here to to identify the smart number to start the question with. This can be time consuming, but once identified, this question can be solved fairly quickly.
2. Another method: If X is total > Non Hawks = 0.7X > Warbs = 0.4(0.7X) > KFs = 0.25(0.4(0.7X)). Our job is to find out : (0.3X + 0.28X + 0.07X)/ X. OR 0.65X/X = 0.65. We need to find 10.65 = 0.35 or 35%.



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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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26 Jul 2014, 22:11
Hi Smyarga,
Can you please explain what " If there are 25 percent as many Kingfishers as PaddyfieldWarblers" means? Though i got the ans right, didnt get the clarity of the above phrase. Thanks in advance.



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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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27 Jul 2014, 17:51



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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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28 Jul 2014, 09:30
Thanks for the explanation



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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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01 Aug 2014, 00:37
For total Birds = 100 Hawks = 30 Non Hawks = 100  30 =70 40% of Non Hawks are Paddy = 28 25% of Paddy are King = 7 Remaining (Non Hawk, Non Paddy, Non King) = 100  (30 + 28 + 7) = 35 Answer = B
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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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29 Apr 2016, 09:45
bagdbmba wrote: In GoshawkEurasian nature reserve 30 percent of the birds are Hawks, and 40 percent of the nonHawks are PaddyfieldWarblers. If there are 25 percent as many Kingfishers as PaddyfieldWarblers in the reserve, then what percent of the birds in the nature reserve are not Hawks, PaddyfieldWarblers, or Kingfishers?
A. 25% B. 35% C. 45% D. 70% E. 80%
P.S: Bunuel/KarishmaCan you please come up with a detail explanation for the solution. And is it a 700+ problem? I doubt although... Total birds = 100 hawks = 30 Non hawks = 70 Paddy = 40% of 70 = 28 Kingfisher = 25% of paddy = 25% of 28 = 7 Hawks + paddy + kingfisher = 65 birds in the nature reserve are not Hawks, PaddyfieldWarblers, or Kingfishers = 100 – 65 = 35
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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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23 Jun 2017, 18:21
bagdbmba wrote: In GoshawkEurasian nature reserve 30 percent of the birds are Hawks, and 40 percent of the nonHawks are PaddyfieldWarblers. If there are 25 percent as many Kingfishers as PaddyfieldWarblers in the reserve, then what percent of the birds in the nature reserve are not Hawks, PaddyfieldWarblers, or Kingfishers?
A. 25% B. 35% C. 45% D. 70% E. 80%
P.S: Bunuel/KarishmaCan you please come up with a detail explanation for the solution. And is it a 700+ problem? I doubt although... To solve this question you could just use a simple number 100(.30)= 30 Hawk 100(.70)(.40) =28 PaddyfieldWarbler 28(1/4) =7 Kingfisher 30 + 28 +7= 65 10065= 35 Thus "B"



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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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07 Sep 2017, 13:22
"40 percent of the nonHawks are PaddyfieldWarblers. If there are 25 percent as many Kingfishers as PaddyfieldWarblers in the reserve" When we talk about 40% of the nonhawks, then shouldn't we consider PaddyfieldWarblers as a percentage within the nonHawks rather than the total PaddyfieldWarblers? It's confusing the way it has been written. Can someone provide some clarity? abhimahna



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Re: In GoshawkEurasian nature reserve 30 percent of the birds [#permalink]
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09 Sep 2017, 01:56
TheMastermind wrote: "40 percent of the nonHawks are PaddyfieldWarblers. If there are 25 percent as many Kingfishers as PaddyfieldWarblers in the reserve" When we talk about 40% of the nonhawks, then shouldn't we consider PaddyfieldWarblers as a percentage within the nonHawks rather than the total PaddyfieldWarblers? It's confusing the way it has been written. Can someone provide some clarity? abhimahnaHi TheMastermind , Here I go: Total Birds = 100x Hawks = 30x Non Hawks = 70x Paddy = 28x Kingfisher = 7x There total birds which are either Hawks, Paddy or Kingfisher = 30x = 28x + 7x = 65x Hence, birds which are neither of these = 35x or 35%. If you see my solution, I considered "PaddyfieldWarblers as a percentage within the nonHawks" and this is correct. I am not sure what made you confused. You should not assume that hawks may also have some paddy unless not given Does that make sense?
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