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Cash Giveaway

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.


Puzzle ID:#2531
Fun:*** (2.35)
Difficulty:** (1.79)
Submitted By:tommo***




I take three envelopes and put $5 in the first, $10 in the second and $20 in the third. The average value in the envelopes is $11.66. I mix up the envelopes and pick two at random. I give you a choice of the two envelopes; you pick one and look inside to see $10. I then give you the option of swapping to one of the other envelopes. How much would you get on average by swapping your choice of envelopes?

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