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LSAT Explanations › PrepTest 151 › Section 4

Logical Reasoning

PrepTest 151 Section 4

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

25 question explanationsUnscored section

Choose a question

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

  1. Q1:
    Joe: All vampire stories are based on an absurd set of…Point at Issue
  2. Q2:
    A company decided to scan all of its salespersons'…Paradox

    The digitization project was a failure.

  3. Q3:
    Politician: The legal right to free speech does not…Main Point

    It is justifiable to ban the types of speech I cited.

  4. Q4:
    Art critic: Nowadays, museum visitors seldom pause to…Necessary Assumption

    People don’t want to engage with art the way they used to.

  5. Q5:
    Heavy tapestry fabrics are appropriate only for use in…Most Strongly Supported

    Heavy tapestry appropriate ➞ ~~need laundering~~
    2.

  6. Q6:
    The construction of new apartments in Brewsterville…Paradox

    Rents rose in Brewsterville even as the housing supply rose.

  7. Q7:
    Politicians often advocate increased overall economic…Flawed Reasoning

    Increasing overall economic productivity may benefit businesses but hurt workers. 

  8. Q8:
    A good movie reviewer should be able to give favorable…Identify the Conclusion

    A skilled movie reviewer ought to be able to give positive reviews of movies they don’t like.

  9. Q9:
    The brain area that enables one to distinguish the…Flawed Reasoning

    Practicing and playing a musical instrument changes brain structure.

  10. Q10:
    Researcher: Overhearing only one side of a cell-phone…Most Strongly Supported

    Hearing one half of a cellphone conversation is distracting. 

    **REASONING:** 

    1. You have to guess what the person on the other side of the conversation is saying, and
    2. People on cellphones talk unusually loudly.

  11. Q11:
    A new treatment for muscle pain that looked very…Flawed Parallel Reasoning

    The treatment is probably bad.

  12. Q12:
    If future improvements to computer simulations of…Strengthen

    Computer simulations improve their info about safety features to be just as good as test crashes ➞ car manufacturers will use less test crashes

  13. Q13:
    Legislator: My colleague says we should reject this…Flawed Reasoning

    We should approve the act.

  14. Q14:
    A new computer system will not significantly increase…Complete the Argument

    The new computer system won’t make a significant improvement to productivity. [Expected conclusion]

  15. Q15:
    Columnist: Many car manufacturers trumpet their cars'…Flawed Reasoning

    Manufacturers likely inflate their fuel efficiency figures.

  16. Q16:
    Tenants who do not have to pay their own electricity…Weaken

    Society will save energy if landlords install electricity meters and bill tenants for heating.

  17. Q17:
    The position that punishment should be proportional…Role in Argument

    It is unsustainable to argue that both:

    1. Punishments should be proportional to the seriousness of the crime, and
    2. Repeat offenders should get worse punishments than first time offenders.

  18. Q18:
    Blogger: Traditionally, newspapers have taken…Necessary Assumption

    The best way to understand how journalism changed is to think about different business strategies.

  19. Q19:
    Any government practice that might facilitate the…Must be True

    If a government practice might help abuse power, you should only do it if there is a good reason.

  20. Q20:
    According to a theory embraced by some contemporary…Sufficient Assumption

    The radical musicians’ music is inconsistent with their theory.

  21. Q21:
    Evolution does not always optimize survival of an…Method of Reasoning

    Evolution doesn’t always maximize survival of species.

  22. Q22:
    Biologist: When bacteria of a particular species are…Weaken

    The bacteria probably detect red light by checking how much energy their chlorophyll makes.

  23. Q23:
    If a piece of legislation is the result of negotiation…Flawed Reasoning

    Satisfies no one ➞ negotiation

  24. Q24:
    After a nuclear power plant accident, researchers…Most Strongly Supported

    Materials found after a nuclear plant accident: iodine, tellurium, cesium.

  25. Q25:
    If ecology and the physical sciences were evaluated by…Parallel Reasoning

    Ecology is being evaluated by different criteria than the physical sciences are.

About this section

Originally Section 3 of PrepTest 81, administered in June 2017.

Question types

Flawed Reasoning5 · 20%
Most Strongly Supported3 · 12%
Necessary Assumption2 · 8%
Paradox2 · 8%
Weaken2 · 8%
Complete the Argument1 · 4%
Flawed Parallel Reasoning1 · 4%
Identify the Conclusion1 · 4%
Main Point1 · 4%
Method of Reasoning1 · 4%
Must be True1 · 4%
Parallel Reasoning1 · 4%
Point at Issue1 · 4%
Role in Argument1 · 4%
Strengthen1 · 4%
Sufficient Assumption1 · 4%

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

Section 3: Logical Reasoning
All PrepTest 151 explanations

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