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LSAT Explanations › PrepTest 150 › Section 3

Logical Reasoning

PrepTest 150 Section 3

Find the question you’re working on. Explore the reasoning, understand each answer, and learn from your mistakes.

25 question explanationsScored section

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Explanations for every question, find them by number or text.

  1. Q1:
    In constructing a self-driving robotic car, engineers face…Complete the Argument

    Engineers designing self-driving cars should look at the principles fish use to navigate in schools.

  2. Q2:
    The Common Loon is a migratory bird that winters…Paradox

    Loons will often intrude on a lake that's occupied by other loons instead of taking a nearby suitable lake.

  3. Q3:
    Taxi driver: My passengers complained when, on a hot day…Principle – Strengthen

    It was the correct decision to turn off the air conditioner.

  4. Q4:
    The reason J.S. Bach is remembered is not that he had…Weaken

    Bach is remembered because he was prolific, not because his works were of high quality on average.

  5. Q5:
    Pundit: Clearly, the two major political parties in this city…Flawed Reasoning

    The parties are sharply divided on issues.

  6. Q6:
    The waters surrounding Shooter's Island have long been…Strengthen

    The still waters around Shooter's Island serve as a nursery for the juveniles.

  7. Q7:
    Pollster: When opinion researchers need a population sample…Necessary Assumption

    Polls on the nation's opinions would be less accurate if the census became voluntary.

  8. Q8:
    Of the many works in a collection from Japan's Tokugawa period…Flawed Parallel Reasoning

    "Spring and Autumn Maples" is among the most valuable pieces in the collection.

  9. Q9:
    Marketing agent: A survey of my business clients reveals…Flawed Reasoning

    90% of the agent's clients increased their profit at least tenfold last year.

  10. Q10:
    Changes in Britain's National Health Service have led many…Strengthen

    The discontinuation of on-site laundry services will not put patients at risk.

  11. Q11:
    Many newspapers have cut back on book reviews, replacing…Identify the Conclusion

    Cutting back on book reviews is ill-advised.

  12. Q12:
    Doctor: There will be more local cases of flu infection…Sufficient Assumption

    There will be more local cases of flu infection this year compared to last year.

  13. Q13:
    Hendry: Most employee strikes should be legally permitted…Point at Issue
  14. Q14:
    Most popular historical films are not documentaries; they are…Principle – Justify

    Uninformed viewers should not regard dramatic historic films as accurate portrayals of historic events.

  15. Q15:
    Carrillo: Using the number of existing primate species…Point at Issue
  16. Q16:
    Automobile executive: Our critics say that the communications…Flawed Reasoning

    The critics are wrong.

  17. Q17:
    Since mosquito larvae are aquatic, outbreaks of mosquito-borne…Paradox

    Mosquitoes-borne disease outbreaks generally appear more often after wet weather.

  18. Q18:
    Efforts to get the public to exercise regularly, which have…Necessary Assumption

    Efforts to get the public to exercise regularly would be more successful if they emphasized the dangers of a sedentary lifestyle, rather than focusing on positive effects of exercise.

  19. Q19:
    Henry: Engines powered by electricity from batteries cause less…Weaken

    Umit's conclusion is that we should not replace standard automobiles with battery-powered vehicles, if our goal is to reduce urban pollution.

  20. Q20:
    History student: It is unfair for the History Department…Point at Issue
  21. Q21:
    Finance minister: The World Bank's "Doing Business" report ranks…Argument Evaluation

    Our government's "Doing Business" ranking will probably improve.

  22. Q22:
    Commentator: Unfortunately, Roehmer's opinion column has a…Flawed Reasoning

    The polarizing effect of Roehmer's column is probably not a problem for her.

  23. Q23:
    Fine short story writers are unlikely to become great novelists…Parallel Reasoning

    Fine short story writers are unlikely to become great novelists.

  24. Q24:
    Politician: Every regulation currently being proposed by…Flawed Reasoning

    Each of the proposed regulations would help the economy.

  25. Q25:
    Essayist writing in 2012: At its onset, a new medium is limited…Principle – Justify

    It is too early to understand the e-book as a medium.

About this section

Originally Section 3 of PrepTest 84, administered in June 2018.

Question types

Flawed Reasoning5 · 20%
Point at Issue3 · 12%
Necessary Assumption2 · 8%
Paradox2 · 8%
Principle – Justify2 · 8%
Strengthen2 · 8%
Weaken2 · 8%
Argument Evaluation1 · 4%
Complete the Argument1 · 4%
Flawed Parallel Reasoning1 · 4%
Identify the Conclusion1 · 4%
Parallel Reasoning1 · 4%
Principle – Strengthen1 · 4%
Sufficient Assumption1 · 4%

Based on our explanation classifications. Each of the 25 questions is counted once.

Section 2: Logical Reasoning
Section 4: Reading Comprehension
All PrepTest 150 explanations

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