Weekly Challenge
Five original questions for the week of August 17, 2026. No timer. Check each answer as you go.
The town of Riverton banned single-use plastic bags in 2024. Since then, plastic litter in local parks has fallen by half. The mayor credits the ban.
Which of the following, if true, most strengthens the mayor's claim?
If the litter that disappeared was the exact kind the ban targeted, the ban is the likely cause. E would weaken by offering an alternative.
Critics say the new voting machines are unreliable because several counties reported errors. But the reported "errors" were all cases of voters touching the wrong part of the screen, which is a training issue, not a machine issue. So the critics' evidence does not show what they claim.
The argument proceeds by
The speaker does not dispute the reported errors happened. Instead it reframes them as user error, pulling the rug out from the critics' conclusion.
All of the museum's ancient coins are kept in the basement vault. Some items in the basement vault are on loan from private collectors.
Which of the following can be properly inferred?
The coins are in the vault and some vault items are loans. It is possible some coins are the loaned items, but nothing forces it. "May" is the safe word.
A company found that employees who work from home submit 25 percent more code each week than employees who work in the office. The CEO concludes that working from home makes employees more productive.
Which of the following, if true, most weakens the CEO's conclusion?
If the remote group was already the strongest engineers, experience, not location, explains the gap. The comparison was never fair.
Studying in short sessions across several days beats cramming the night before, and reviewing old material beats re-reading notes. Students who want better grades should therefore space out their studying and test themselves on past topics.
The main point of the argument is that
The "therefore" sentence is the conclusion. Everything before it is evidence for that recommendation.
A free diagnostic shows your starting score, then a study plan tells you what to work on next.
Last updated October 12, 2026