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Thinking fast, slow, and super slow - David Bessis

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How mathematicians train their intuition

Thinking fast, slow, and super slow How mathematicians train their intuition David Bessis Dec 18, 2025 387 48 69 Share A ball and a bat cost a total of $1.10. The bat costs $1 more than the ball. How much does the ball cost? I borrowed this problem from Daniel Kahneman ’s Thinking, Fast and Slow . I encourage you to try it with your friends. Most people will answer that the ball costs 10¢, but that’s not the right answer. If the ball cost 10¢, then the bat costs $1.10—since it costs $1 more than the ball—and the ball and the bat together cost $1.20. If you tell them why their answer is wrong,

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