A population of game ducks

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsMust be True

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Stimulus

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

What this question is testing

Must be True

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question

Which one of the following can be inferred from

Answer choices

Correct68% picked this
The population of game ducks at the western lake contains a lower percentage of adult males than the population
Why this is right
Answer A is correct.
Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.
68%
Trap7% picked this
The population of game ducks at the eastern lake contains a higher percentage of nonadult game ducks than the population
7%
Trap18% picked this
The total number of male game ducks is higher in the eastern lake’s population than in
18%
Trap5% picked this
The number of nonadult ducks hatched in a breeding season is higher in the eastern lake’s population than
5%
Trap2% picked this
Adult female game ducks outnumber nonadult female game ducks in the
2%

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