tea/coffee puzzle (SPOILER)

[A.TINO]

> Take a half a cup of tea, and a half a cup of coffee.
> Take one tablespoon of the tea and mix it in with the coffee.
> Take one tablespoon of the mixture and mix it back in with the tea.
>
> The question is, which of the two cups (if either) contains more of
> its original contents, and WHY.

They each contain the same amount of their original contents.
For every drop of tea in the coffee-cup, there's a corresponding drop of
coffee in the tea-cup; likewise, for every drop of tea missing from
the tea-cup, there's a corresponding drop of coffee missing from
the coffee-cup.

_______
Al Tino
!hou2f!tino