Dynamist Blog

Doing the Math

Quite a few readers have written to ask about the answer to the bat-and-ball question in my NYT column. Here's the relevant equation: $1.05-0.05=$1.00.

Interestingly, when Shane Frederick asks a different version of the question, substituting a difference of 13 cents for a bagel and banana totaling 37 cents, many fewer people get the answer wrong--because it's not intuitive.

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