TITLE: Russian Old Merchant Problems
QUESTION [6 upvotes]: Anybody know where I can find more of these old merchant problems:

Lui: Please tell us a little bit about your early education. Were you already interested in math- ematics as a child?
Arnol′d: The Russian mathematical tradition goes back to the old merchant problems. Very  young children start thinking about such
  problems even before they have any knowledge of numbers. Children
  five to six years old like them very much and are able to solve them,
  but they may be too difficult for university graduates, who are
  spoiled by formal mathematical training. A typical example is:
You take a spoon of wine from a barrel of wine, and you put it into
  your cup of tea. Then you return a spoon of the (nonuniform!) mixture
  of tea from your cup to the barrel. Now you have some foreign
  substance (wine) in the cup and some foreign substance (tea) in the
  barrel. Which is larger: the quantity of wine in the cup or the
  quantity of tea in the barrel at the end of your manipulations?
http://www.math.upenn.edu/Arnold/Arnold-interview1997.pdf

REPLY [2 votes]: I havve a copy of this book and I am pretty sure it might be exactly what you are looking for.  http://www.amazon.com/The-Moscow-Puzzles-Mathematical-Recreational/dp/0486270785
The problems range in difficulty from simple to suprisingly difficult but none that I remember required any more math than simple multiplication.