Logical ReasoningDifficulty: Easy

PT105 S2 Q3 Explanation

Manager: Our new computer network,

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

TopicsNecessary Assumption

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Stimulus

Manager: Our new computer network, the purpose of which is to increase productivity, can be installed during the day, which would disrupt our employees’ work, or else at night, which would entail much higher installation charges. should have the network installed during the day.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

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

The question
3.

The manager’s argument assumes which one of

Answer choices

  1. Irrelevant Comparison5% picked this

    The monetary value of the network equipment would not exceed the cost of having the

    This answer choice introduces an issue about the monetary value of the network equipment, which is not mentioned or implied in the argument. The manager’s cost comparison focuses solely on installation costs versus lost productivity, not on the value of the equipment.

  2. Correct89% picked this

    The monetary value of any productivity lost during a daytime installation would be less than the difference between

    Why this is right

    This choice provides the needed link by comparing the monetary value of the productivity lost with the additional installation cost at night. If we negated this and said that "the money we lose from installing during the day is AT LEAST AS MUCH as the additional cost for nighttime installation", that would weaken the argument, by creating the possibility that we would actually save money with the nighttime installation.

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

  3. Irrelevant Comparison1% picked this

    A daytime installation would be completed by no larger a crew and would take the crew no more time

    This option compares the efficiency of a daytime versus nighttime crew. However, the argument's concern is not about the duration or the size of the installation crew, but rather about the financial trade-off between installation costs and productivity losses.

  4. Too Strong: most / immediately1% picked this

    Once the network has been installed, most of the company’s employees will be able to use it immediately

    This answer choice addresses the immediate post-installation productivity boost once the network is installed. The argument doesn't make any assumptions about what comes after the installation. It's only about which type of installation is going to save the company money.

  5. Opposite (if anything)3% picked this

    Most of the company’s employees would be able to work productively while a daytime installation

    The word "most" is almost always wrong on Necessary Assumption because it rarely poses a crucial difference whether something is true for 51% of cases vs. only 49%. Similarly, here, it wouldn't matter whether 49% of the employees can work during the installation vs. 51% Plus, given that we know a daytime installation WILL disrupt productivity, if anything this sounds like the opposite of what the author is thinking.

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