Logical ReasoningDifficulty: Medium

PT117 S2 Q17 Explanation

The tiny hummingbird weighs little,

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

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Stimulus

The tiny hummingbird weighs little, but its egg is 15 percent of the adult hummingbird’s weight. The volume and weight of an adult goose are much greater than those of a hummingbird, but a goose’s egg is only about 4 percent of its own weight. An adult ostrich, much that is only 1.6 percent of its own weight.

What this question is testing

Most Supported

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.

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The question
17.

Which one of the following propositions is best illustrated by the

Answer choices

  1. Out of Scope13% picked this

    The eggs of different bird species vary widely in their ratio of

    Out of Scope: ratio of egg weight/volume We are only told the ratio of the egg's weight to the adult's weight/volume. This answer choice is about the ratio of the egg's volume to the egg's weight. We don't have any idea, for example, with hummingbird eggs what the ratio of volume to weight would be.

  2. Too Strong Defies Common Sense7% picked this

    The smaller and lighter the average adult members of a bird species are, the larger and heavier the

    According to this answer, a hummingbird's egg is larger and heavier than an ostrich's egg. If you've ever seen an ostrich's egg, you'll know it's bigger than 10 hummingbirds, let alone 1 hummingbird egg. The relationship we were looking for was, the smaller and lighter the average adult members of a bird species are, the bigger the ratio of egg weight to adult's weight.

  3. Correct75% picked this

    The ratio of egg weight of a species to body weight of an adult member of that species is smaller for larger

    Why this is right

    This reflects the continuum we were presented with. Percent's are the same as ratios. If I say that my rent is 35% of my income, then the ratio of my rent to my income is 35 : 100. smaller birds ------------------- larger birds 15% 4% 1.6% hummingbird goose ostrich

    Skill tested: Most Supported · how this choice captures the argument's function is the move to repeat next time.

  4. Out of Scope: size of eggs4% picked this

    The size of birds’ eggs varies greatly from species to species but has little effect on the volume and

    We never talk about the size of eggs. We talk about the size of the adult hummingbird / goose / ostrich, but never the size of eggs. We only talk about the weight of eggs, as a proportion of the adult's weight. Weight and size are not the same thing. A bowling ball and a basketball are the same size, but they are two very different weights.

  5. Out of Scope: egg size0% picked this

    Bird species vary more in egg size than they do in average body

    Just as we discussed with (D), this paragraph says nothing about egg size. For all we know, it never varies in size, only in weight (you can be the same size but have more weight if you are more dense, just like a bowling ball is heavier than a basketball, despite being about the same size).

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