Medium
Critical Thinking
Puzzles requiring careful interpretation and structured thinking.
Critical Thinking Puzzles
Hard
A store reports that sales increased after a new advertisement was launched. Can we conclude that the advertisement caused the entire increase?
Medium
A person says, "I have never missed a train, so I will definitely catch today's train." What logical problem exists?
Hard
A survey of 500 students finds that 80% prefer online study materials. Can this result automatically be applied to every student in the country?
Expert
A company says, "Our product has no negative reviews, therefore every customer is satisfied." What important information could be missing?
Medium
A sign says: "No vehicles are allowed beyond this point." A person walks through carrying a bicycle. Has the person necessarily violated the sign?
Hard
A shop advertises: "Buy two shirts and get one free." A customer buys two shirts and receives a third shirt. How many shirts has the customer paid for?
Medium
A statement says, "Every student in this class passed the exam." You meet one student from the class who failed. What can you conclude?
Hard
A company reports that its sales increased by 50% in one quarter. It also reports that its profit increased by only 5%. Does this prove that the company became less profitable per sale?
Medium
A survey of 100 people finds that 80 like tea and 70 like coffee. Can you conclude that exactly 50 people like both?
Hard
A product price is reduced by 10% and then increased by 10%. A customer claims the price is back to its original value. Is the claim correct?
Medium
A person says, "I have never lied in my life." What can be concluded from this statement alone?
Hard
A study finds that people who exercise regularly have lower average blood pressure than people who do not. Does this alone prove that exercise caused the difference?
Medium
A box contains only red and blue balls. You draw a red ball. Can you conclude that the next ball will be blue?
Hard
A statement says: "All statements in this box are false." Is the statement true or false?
Medium