Who makes it, has no need of it.
Who buys it, has no use for it.
Who uses it can neither see nor feel it.

A very rich lady goes with a bag of coins (not more than 400) to the city. In the city she meets four vagabonds. She gives the first vagabond 4 coins and a quarter of the number of coins which is left in the bag. She applies the same procedure to the second, third and fourth vagabond (so division by 4 worked always). With how many coins did she leave home?

There is something strange with the 5 euro note. What is it?