Originally posted by Stefan Haertel
Something else (may not work here, but try it on your friends!):
Imagine you're the captain of a ship.
The ship sails out from London, carrying fifteen containers of carrots to Arkhangelsk. There, it loads ninety containers of wheat, five containers of paper and three red cars, and sails on to Anchorage.
In Anchorage, it unloads the carrots and loads ten containers of fish, and sails on to Vancouver.
In Vancouver, it unloads two red cars and loads three blue cars, and sails on to Yokohama.
In Yokohama, it unloads the fish and loads two containers of computer stuff, and sails on to Taipeh.
In Taipeh, it unloads all the freight except for one blue car and one container full of computer stuff, and loads seventy-three containers of plastic articles and nineteen green cars.
It sails to Cape Town where the rest of the freight is unloaded.
How old is the captain?