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# A population of game ducks at a western lake contains 55 males to ever

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Senior Manager
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A population of game ducks at a western lake contains 55 males to ever  [#permalink]

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23 Mar 2017, 09:25
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75% (hard)

Question Stats:

60% (02:42) correct 40% (02:57) wrong based on 148 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.
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Re: A population of game ducks at a western lake contains 55 males to ever  [#permalink]

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23 Mar 2017, 11:33
The argument says that ducks that have not yet bred there are only slightly more males than females but males are more then female when it comes to adult ducks. Now western lake has male female ratio as 55 : 45 that means 11: 9 and eastern lake has proportion of ducks as 65: 35 that means 13:7---> so we can conclude easily that number of adult ducks in western lake is low then in eastern lake...its A

vikasp99 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.

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Re: A population of game ducks at a western lake contains 55 males to ever  [#permalink]

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23 Mar 2017, 11:55
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.

Inference: 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 old male ducks.

WL- 55 (M) 45 (F)
EL- 65(M) 35(F)

WL- Less sex disparity than EL, less old/adult male ducks than EL.
Correct.

(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.
EL- more sex disparity -> more old male ducks -> higher percentage of ADULT game ducks.

Opposite.

(C) The total number of male game ducks is higher in the eastern lake’s population than in the western lake population.
Ratio is given. No absolute numbers. Can't be inferred.
(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.
No statistics on that.

(E) Adult female game ducks outnumber nonadult female game ducks in the eastern lake’s population.

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A population of game ducks at a western lake contains 55 males to ever  [#permalink]

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23 Aug 2017, 10:51
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.

We do not even need the last sentence. It is inferred from the first too.

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.
What is good in "infer" type of question, we can find the option that is truly infered and even not to look to the other options. (You can not do it with strengthen-weaken questions).
This is correct option. We have 55% of males in WL vs 65% in EL. You can even disregard young ducks there. Because this ratio even higher for adult ducks. If I meet such question at GMAT, I think, I will skip other options.

(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.
It is quite the opposite to A, so it is wrong

(C) The total number of male game ducks is higher in the eastern lake’s population than in the western lake population.
Common GMAT trap. We can not say anything about the total nu,ber if only the percentage is given. And it is true also for the opposite situation.

(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.
Same trap as in C

(E) Adult female game ducks outnumber nonadult female game ducks in the eastern lake’s population.
We do not know anything about female ducks in any lake (if we do not speak about the ratio to males).
A population of game ducks at a western lake contains 55 males to ever   [#permalink] 23 Aug 2017, 10:51
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