Thirsty Friends

You have a large number of friends coming over and they all get thirsty. Your first friend asks for 1/2 a cup of water. Your second friend asks for 1/4 a cup of water. Your third friend asks for 1/8 a cup of water, etc.

How many cups of water do you need to serve your friends?

6 guesses to Thirsty Friends

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• brent

Makes me wonder if they are really that thirsty!

• Howard Lyon

Infinitely less than 1 cup total

• Luca

Just one, for there would never be asked something that would make the total amount be over or even equal to 1

• Crabman

One cup. This is Zeno’s paradox. Starting with 1/2, the limit approached when adding an infinite number of successively halved fractions is 1.

• Howard, you are today’s winner!
Just one. If your friends kept asking for water like this forever one cup would be enough.

• Katie

However many cups there are friends. Who wants to drink from the same cup as somebody else? (although you really only need one)