tough one...

Expert replies

nervesofsteel: Legendary Member; Posts: 594; Joined: Thu Aug 14, 2008 11:51 pm; Thanked: 12 times

by nervesofsteel » Fri Apr 09, 2010 9:12 pm

A population of game ducks at a western lake contains 55 males to every 45 females, while a population of game ducks at an eastern lake contains 65 males for every 35 females. Among those ducks that have not yet bred there are only slightly more males than females, but among older ducks the number of males greatly exceeds the number of females. Because there are appreciably more males among adult ducks than among young ducks, we can infer that the greater the disparity in overall GMAT ratios, the greater the percentage of older male ducks in the population.
Which one of the following can be inferred from the passage?
(A) The population of game duck at the western lake contains a lower percentage of adult males than the population at the eastern lake contains.
(B) The population of game duck at the eastern lake contains a higher percentage of nonadult game ducks than the population at the western lake contains.
(C) The total number of male game ducks is higher in the eastern lake's population than in the western lake population.
(D) The number of nonadult ducks hatched in a breeding season is higher in the eastern lake's population than in the western lake's population.
(E) Adult female game ducks outnumber nonadult female game ducks in the eastern lake's population.

Source: Beat The GMAT — Critical Reasoning | Fri Apr 09, 2010 9:12 pm

reply2spg: Legendary Member; Posts: 1261; Joined: Sun Sep 14, 2008 3:46 am; Thanked: 27 times; GMAT Score:570

by reply2spg » Fri Apr 09, 2010 9:24 pm

Is it C?

nervesofsteel wrote:A population of game ducks at a western lake contains 55 males to every 45 females, while a population of game ducks at an eastern lake contains 65 males for every 35 females. Among those ducks that have not yet bred there are only slightly more males than females, but among older ducks the number of males greatly exceeds the number of females. Because there are appreciably more males among adult ducks than among young ducks, we can infer that the greater the disparity in overall GMAT ratios, the greater the percentage of older male ducks in the population.
Which one of the following can be inferred from the passage?
(A) The population of game duck at the western lake contains a lower percentage of adult males than the population at the eastern lake contains.
(B) The population of game duck at the eastern lake contains a higher percentage of nonadult game ducks than the population at the western lake contains.
(C) The total number of male game ducks is higher in the eastern lake's population than in the western lake population.
(D) The number of nonadult ducks hatched in a breeding season is higher in the eastern lake's population than in the western lake's population.
(E) Adult female game ducks outnumber nonadult female game ducks in the eastern lake's population.

shwetathegmat: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Fri Mar 12, 2010 1:21 am

by shwetathegmat » Fri Apr 09, 2010 10:03 pm

IMO A
what's the OA?

nervesofsteel: Legendary Member; Posts: 594; Joined: Thu Aug 14, 2008 11:51 pm; Thanked: 12 times

by nervesofsteel » Fri Apr 09, 2010 11:45 pm

I will appreciate if reasoning can be shared...

Thanks

neoreaves: Master | Next Rank: 500 Posts; Posts: 208; Joined: Sun Sep 28, 2008 12:30 pm; Thanked: 22 times

by neoreaves » Sat Apr 10, 2010 1:39 am

I wonder what the source is? LSAT ?

This question is surely tough because the comparisons made dont correlate with each other very well ...

e.g in the second sentence non bred ducks are discussed and then compared to older ducks ?? (shouldnt this be between non bred younger ducks and older non bred ducks)

so the comparisons seem very flawed or maybe im getting confused ...so please quote the source

pops: Master | Next Rank: 500 Posts; Posts: 148; Joined: Tue Jun 09, 2009 11:06 pm; Thanked: 7 times

by pops » Sat Apr 10, 2010 4:24 am

nervesofsteel wrote:A population of game ducks at a western lake contains 55 males to every 45 females, while a population of game ducks at an eastern lake contains 65 males for every 35 females. Among those ducks that have not yet bred there are only slightly more males than females, but among older ducks the number of males greatly exceeds the number of females. Because there are appreciably more males among adult ducks than among young ducks, we can infer that the greater the disparity in overall GMAT ratios, the greater the percentage of older male ducks in the population.
Which one of the following can be inferred from the passage?
(A) The population of game duck at the western lake contains a lower percentage of adult males than the population at the eastern lake contains.
(B) The population of game duck at the eastern lake contains a higher percentage of nonadult game ducks than the population at the western lake contains.
(C) The total number of male game ducks is higher in the eastern lake's population than in the western lake population.
(D) The number of nonadult ducks hatched in a breeding season is higher in the eastern lake's population than in the western lake's population.
(E) Adult female game ducks outnumber nonadult female game ducks in the eastern lake's population.

First of all, only fraction is mentioned here i.e. 55 males for every 45 females in west and 65 males for every 35 in east.. hence 'total number of' options can be ruled out.. so C, D are definitely out.
when disparity is more elder males are more... east has more disparity has more adult males.. hence A

gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Sat Apr 10, 2010 4:40 am

nervesofsteel wrote:I will appreciate if reasoning can be shared...

Thanks

this is a wonderful CR & wish Testluv shares his gyan!

Still I am doing my part over here...

Overall picture that we can get from the argument is that the greater the disparity in overall GMAT ratios, the greater the percentage of older male ducks in the population.

Among the 2 categories( westlake & eastern lake) , greater disparity in over all GMAT ratio can be seen in Eastern lake.

So, A fits the bill. By plugging in numbers for other optiosn u can easily eliminate them.

R&D on GMAT algorithm:

https://www.beatthegmat.com/r-d-on-gmat- ... tml#305739

nervesofsteel: Legendary Member; Posts: 594; Joined: Thu Aug 14, 2008 11:51 pm; Thanked: 12 times

by nervesofsteel » Mon Apr 12, 2010 2:43 am

Thanks Ans is A

source LSAT Qnts..

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