Weekly Challenge
Five original questions for the week of September 14, 2026. No timer. Check each answer as you go.
Everyone at the town hall supported the new park, so the whole town must support it.
The reasoning is flawed because it
Town hall attendees are a self-selected group, not the whole town. The argument treats a part as if it were the whole.
A farmer noticed that fields planted with clover between crops produced higher corn yields. She concludes that clover improves the soil for corn.
Which of the following, if true, most strengthens her conclusion?
Holding other factors equal isolates clover as the difference. Without that, rain or fertilizer could explain the yield gap.
All of the bakery's sourdough loaves are baked fresh each morning. The loaf on the counter is not fresh.
What must be true?
Every bakery sourdough loaf is fresh. This loaf is not fresh, so it cannot be one of them. Simple contrapositive.
Online reviews can be faked, cherry-picked, or written by competitors. A restaurant's rating therefore tells you more about its marketing than its food. The only reliable review is your own first visit.
The main point is that
The last sentence is the recommendation everything builds toward. The earlier sentences are reasons to distrust ratings.
The airline's new baggage fee will increase profits, since passengers will keep checking bags at the same rate.
The argument assumes that
The fee only raises profits if it does not drive customers away. If passengers defect to rivals, the "same rate" premise collapses.
A free diagnostic shows your starting score, then a study plan tells you what to work on next.
Last updated October 12, 2026