Logical ReasoningDifficulty: Hard

PT111 S4 Q23 Explanation

The higher the altitude,

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

TopicsParallel

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Stimulus

The higher the altitude, the thinner the air. Since Mexico City’s altitude is higher than that of Panama City, the air must be than in Panama City.

What this question is testing

Parallel

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
23.

Which one of the following arguments is most similar in its reasoning to

Answer choices

  1. Weaker Logic Match34% picked this

    As one gets older one gets wiser. Since Henrietta is older than her daughter, Henrietta must be

    This one is very tempting and usually the last wrong answer people eliminate. As one gets older, one gets wiser. The more A, the more B? We could stretch that to maybe mean "the more years you have, the more wisdom you have", but that's ultimately where this answer is worse than the correct one. This Volume Dial relationship is explicitly presented as something internal to one person. "As one gets older, one gets wiser". That is not the same as saying, "The older you are, the wiser you are." According to this rule, Henrietta at 60 years old is wiser than Henrietta was at 30 years old. Saying Henrietta at 60 years old is wiser than Barack Obama at 55 years old would be derivable from "the older you are, the wiser you are" but it's not derivable from "as one gets older one gets wiser". Different life experiences may have accelerated wisdom for people. We can't neatly transfer higher age to higher wisdom, the way we can neatly transfer higher altitude to thinner air (or more tree rings to older tree).

  2. Weak Evidence Match Bad Validity Match2% picked this

    The more egg whites used and the longer they are beaten, the fluffier the meringue. Since Lydia used more egg whites in her meringue

    Instead of giving us "the more X, the more Y", this answer is giving us, the more X and the more Y, the more Z That difference should already spook us on a first pass. If we read the rest of the argument, it turns out it's pretty badly flawed, since the premise only provides half of that (X and Y) trigger, yet still concludes Z. We'd be objecting, "What if Joseph beat his egg whites for longer? His meringue might still be fluffier!" Then we would hear ourselves and think, "My goodness. Listen to the crazy words coming out of my mouth. What have I become?" and spend the next few hours looking into a bathroom mirror at a Chuck E. Cheese.

  3. Trap1% picked this

    The people who run the fastest marathons these days are faster than the people who ran the fastest marathons ten years ago. Charles is

    Bad Evidence Match Bad Validity Match This doesn't have a great Volume Dial relationship. It's not saying, the more recent you are as a "fastest marathon runner", the faster your time is. It's just a head-to-head comparison between fastest runners today vs. fastest runners 10 years ago. Also, the logic here is very objectionable. Charles is just identified as "a marathon runner", so we have no idea if he qualifies as "someone who runs the fastest marathons these days", and thus we can' apply the can't apply the rule we were given to him.

  4. Correct61% picked this

    The older a tree, the more rings it has. The tree in Lou’s yard is older than the tree in Theresa’s yard. Therefore, the

    Why this is right

    The more X, the more Y The more age a tree has, the more rings it has. A is more X than B L's tree has more age than T's tree Thus, A is more Y than B L's tree has more rings than T's tree X = age, Y, = rings A = tree in Lou's yard, B = tree in Theresa's yard

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

  5. Bad Logic Match2% picked this

    The bigger the vocabulary a language has, the harder it is to learn. English is harder to learn than Italian. Therefore, English must

    This tries to use the Volume Dial relationship backwards. The more X, the more Y The more words in a language, the harder it is to learn The next ingredient should be this: A is more X than B English has more words than Italian does. Instead it's this A is more Y than B English is harder to learn than Italian. With that backwards move, it's not going to match the original argument as much as (D) does.

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