LSATHacks
  • Explanations
  • Tutoring
  • Courses
  • Login
  • Cart
  • Explanations
  • Tutoring
  • Courses
  • Login
  • Cart
LSAT Explanations › PrepTest 158 › Section 4

Logical Reasoning

PrepTest 158 Section 4

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

26 question explanationsScored section

Choose a question

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

  1. Q1:
    The government's tax collection agency has not followed…Weaken

    The tax agency didn't crack down on violations like they planned.

  2. Q2:
    Columnist: Making some types of products from recycled…Flaw

    Products made from recycled material probably damage the environment as much as non recycled material.

  3. Q3:
    Physician: We are constantly bombarded by warnings…Role in Argument

    Only conclusive results from definitive studies should be announced.

  4. Q4:
    A club wanted to determine whether it could increase…Flaw

    Schedule conflicts aren't causing club attendance problems.

  5. Q5:
    The railway authority inspector who recently thoroughly…Parallel Reasoning

    The reporter's claim that the train tracks are in poor condition is doubtful.

  6. Q6:
    If the proposed air pollution measures were to be implemented…Flaw

    If we adopt the proposed measure we will save a billion dollars in health costs.

  7. Q7:
    Newspaper article: Recently discovered clay tablets…Necessary Assumption

    The tablets in Egypt challenge the belief that the Sumerians were the first to create literature.

  8. Q8:
    Climatologist: The waters off the Pacific coast of North America…Main Conclusion

    It may not be correct to say that global warming has warmed the pacific coast.

  9. Q9:
    Robin: Archaeologists can study the artifacts left by ancient…Point at Issue: Disagree
  10. Q10:
    Railroads rely increasingly on automation. Since fewer…Main Conclusion

    We can expect the volume of freight shipped by rails to grow.

  11. Q11:
    In the past, infants who were not breast-fed were fed cow's milk…Most Strongly Supported

    Doctors said to boil cow's milk before feeding it to babies.

  12. Q12:
    The only effective check on grass and brush fires is…Paradox

    Rain puts out fires.

  13. Q13:
    Medical researcher: A new screening test detects certain polyps…Necessary Assumption

    The new test can lead to unnecessary, dangerous operations.

  14. Q14:
    Psychologist: Most people's blood pressure rises when they talk…Strengthen

    Blood pressure rises when talking from psychological stress, not the physical act of talking.

  15. Q15:
    One should only buy a frying pan that has a manufacturer's…Strengthen

    You should only buy a frying pan if it has a warranty.

  16. Q16:
    Journalist: When judges do not maintain strict control over…Weaken

    Lawyers' obstructions prevent juries from reaching correct verdicts.

  17. Q17:
    Mateo: Global warming has caused permafrost to melt under…Principle

    The auto industry should pay for the villagers' relocation

  18. Q18:
    Lindsey: Several people claim that our company was unfair…Flaw

    The company acted fairly.

  19. Q19:
    It is widely known that the rescue squads serving high…Paradox

    Rescue squads save a lot of climbers each year.

  20. Q20:
    Paula: Earthlike planets seem to be the rule rather than…Point at Issue: Disagree
  21. Q21:
    Developer: The builders of the Glen Veil apartment complex…Principle – Justify

    Residents should vote to fund construction of the road.

  22. Q22:
    Historian: Because medieval epistemology (theory of knowledge)…Weaken

    We should define medieval epistemology in such a manner that it is whatever its practitioners' beliefs are.

  23. Q23:
    Official: Six months ago, the fines for parking violations…Flaw

    We should raise fines again to reduce violations.

  24. Q24:
    Consumer advocate: Some agricultural crops are now…Weaken

    The drugs will end up in the general food supply.

  25. Q25:
    Most of the members of the Bargaining Unit Number 17…Complete the Argument

    Some of the government employees in the Hanson building are programmers.

  26. Q26:
    Every Labrador retriever in my neighborhood is…Parallel Reasoning (Flawed)

    Training, not genetic makeup, accounts for the dogs' good behaviour.

About this section

Originally Section 4 of PrepTest 90, administered in May 2020.

Question types

Flaw5 · 19%
Weaken4 · 15%
Main Conclusion2 · 8%
Necessary Assumption2 · 8%
Paradox2 · 8%
Point at Issue: Disagree2 · 8%
Strengthen2 · 8%
Complete the Argument1 · 4%
Most Strongly Supported1 · 4%
Parallel Reasoning1 · 4%
Parallel Reasoning (Flawed)1 · 4%
Principle1 · 4%
Principle – Justify1 · 4%
Role in Argument1 · 4%

Based on our explanation classifications. Each of the 26 questions is counted once.

Section 3: Logical Reasoning
All PrepTest 158 explanations

Hi, I'm Graeme Blake

I scored a 177 on the LSAT. I founded LSATHacks and created the LSAT Mastery Seminars to help students succeed.

I’ve personally written explanations for 5,000+ LSAT questions. If you find these explanations helpful, you'll definitely like our courses.

Join my email list for LSAT study tips and resources.

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Resources

  • Articles
  • Blog
  • Free Email Course
  • LSAT Preptest Converter
  • Experimental Section Checker
  • LSAT Prep Books

About LSATHacks

  • About/Contact
  • Courses
  • Free Trial

Community

  • Discord
  • Social Media
  • Webinars
Disclaimer: Use of these explanations requires official LSAT preptests. LSAT is a registered trademark of LSAC.
LSAC does not review or endorse specific test preparation materials or services and has not reviewed this site.

© Copyright 2026 LSATHacks. All Rights Reserved. | Privacy | Terms