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# A population of game ducks at a western lake contains

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A population of game ducks at a western lake contains  [#permalink]

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21 Sep 2017, 07:40
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4
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Difficulty:

85% (hard)

Question Stats:

59% (02:52) correct 41% (02:57) wrong based on 331 sessions

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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 sex 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: LSAT

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Re: A population of game ducks at a western lake contains  [#permalink]

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21 Sep 2017, 07:57
A can be safely inferred..
western -- 55% males
Eastern -65% males
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Re: A population of game ducks at a western lake contains  [#permalink]

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04 Oct 2017, 06:23
sobby wrote:
A can be safely inferred..
western -- 55% males
Eastern -65% males

I agree with sobby. broall, may we have the OE, please?
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A population of game ducks at a western lake contains  [#permalink]

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04 Oct 2017, 06:51
Sorry, OA is A. I have updated OA.

Spoiler: :: OE
If time is tight—or you find that you cannot follow the argument as presented—this one is
practically screaming, “Skip me for now; come back to me later on.” Handling it requires a
firm grasp on the comparisons offered, as well as on the direct relationship that is the
author’s conclusion. Let’s start with that. According to the author, one will find a higher
percentage of older male ducks when there is a great disparity in sex ratios overall (i.e. all
males : all females). How come? Because among older ducks there are a lot more males,
whereas among younger ducks the male : female ratio is much closer to 1 : 1. In other
words, the more the male ducks strongly outnumber the females, the likelier it is that the
older males will outnumber the younger ones.

Compare the male : female ratio at the two lakes in question. The western lake’s is close to 1
: 1 (55 : 45), while the eastern lake’s is almost 2 : 1 (65 : 35). Which lake, according to the
conclusion, should have a greater percentage of older males? The eastern—that’s the lake
with the greater male : female disparity. So the western lake should have a lower percentage
of older males . . . and that’s just what (A) points out.
(B) The data in the argument compare the ages of adult and nonadult males. We cannot
(C) No conclusion about a total population can be drawn from a male : female ratio.
Contrary to (C), the western lake could have many more male ducks than the eastern, so
long as the western’s population reduces to 55 : 45 and the eastern’s to 65 : 35.
(D) introduces an issue—hatching time—that is totally removed from the argument. Hence,
(D) is completely unacceptable as an inference.
because no data comparing those groups are provided. The conclusion only concerns
males.

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Re: A population of game ducks at a western lake contains  [#permalink]

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04 Oct 2017, 06:57
broall wrote:
Sorry, OA is A. I have updated OA.

Spoiler: :: OE
If time is tight—or you find that you cannot follow the argument as presented—this one is
practically screaming, “Skip me for now; come back to me later on.” Handling it requires a
firm grasp on the comparisons offered, as well as on the direct relationship that is the
author’s conclusion. Let’s start with that. According to the author, one will find a higher
percentage of older male ducks when there is a great disparity in sex ratios overall (i.e. all
males : all females). How come? Because among older ducks there are a lot more males,
whereas among younger ducks the male : female ratio is much closer to 1 : 1. In other
words, the more the male ducks strongly outnumber the females, the likelier it is that the
older males will outnumber the younger ones.

Compare the male : female ratio at the two lakes in question. The western lake’s is close to 1
: 1 (55 : 45), while the eastern lake’s is almost 2 : 1 (65 : 35). Which lake, according to the
conclusion, should have a greater percentage of older males? The eastern—that’s the lake
with the greater male : female disparity. So the western lake should have a lower percentage
of older males . . . and that’s just what (A) points out.
(B) The data in the argument compare the ages of adult and nonadult males. We cannot
(C) No conclusion about a total population can be drawn from a male : female ratio.
Contrary to (C), the western lake could have many more male ducks than the eastern, so
long as the western’s population reduces to 55 : 45 and the eastern’s to 65 : 35.
(D) introduces an issue—hatching time—that is totally removed from the argument. Hence,
(D) is completely unacceptable as an inference.
because no data comparing those groups are provided. The conclusion only concerns
males.

Thank you! The stats just went from 10% correct to 42% correct, so that makes more sense!
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Re: A population of game ducks at a western lake contains  [#permalink]

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12 Dec 2017, 23:09
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broall 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 sex 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: LSAT

We know basically two things, but they are separated in the text by a vast distance so it's hard to put them together.

1. 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.

2. the greater the disparity in overall sex ratios, the greater the percentage of older male ducks in the population.

With these two pieces of information we can infer that Eastern Lake is older than Western Lake.

(A) says that Western Lake is younger, which is the same thing as the Eastern Lake is older. So this is the correct answer.
(B) says the Eastern Lake is younger, which is the opposite of what we can infer.
(C) says nothing about which lake is older. Also, from the stimulus we know information about percentages, nothing about amounts of ducks. Depending on which lake was bigger the claim could be severely challenged.
(D) is out of scope. We know nothing about the ducks hatched in a breeding season.
(E) twists around the second claim we know to be true. The second claim says that the greater the disparity in sex ratios the greater the percentage of older male ducks. It says nothing of the percentage of older female ducks.
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Re: A population of game ducks at a western lake contains  [#permalink]

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21 Dec 2017, 23:56
broall 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 sex 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: LSAT

Tricky question! I analyze all from the premise, nonetheless answer is inferred only from the conclusion of the argument.

This passage will make us overwhelmed with the abundance of data on the premise. Good question!
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Re: A population of game ducks at a western lake contains   [#permalink] 21 Dec 2017, 23:56
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