puzzled


I place $20 in a box.
So do you.
Now the box contains $40, and we both know it.
I sell the box to you for $30.
And we both walk away with a $10 profit.

can you tell what’s wrong with the sentence above?

Person 1: (-$20) + (+$30) = +$10
Person 2 (-$20) + (-$30) + (+$40) = -$10

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