1. Two ducks before a duck, two ducks behind a duck and a duck in the middle are how many ducks?
2. In the barnyard is an assortment of chickens and pigs. Counting heads, one finds 13; counting legs, one finds 46. How many pigs and how many chickens are there?
3. You have an 8 liter jug and a 3 liter jug. Both containers are unmarked. You need exactly 4 liters of water. How can you get it, if a water faucet is handy? Be specific.
4. This is a question about international law. If an international jetliner took off from San Francisco and headed for Montreal, Canada but ran into bad weather and crashed exactly on the U.S.-Canadian border, where would they be required by law to bury the survivors- in the U.S., in Canada, or on the border?

The Tree Problem:

1. Chuck planted an unusual orange tree one afternoon. It came with 4 oranges on it and the number of oranges on the tree doubles each morning. Chuck, upon returning home for lunch each day, picks and eats 3 oranges for his lunch.
2. Fred has an unusual grapefruit tree. Each morning four more grapefruits grow on the tree. His family picks and eats 6 grapefruits at lunchtime.
3. How many grapefruits were on Fred's tree in the morning on the day Chuck planted his tree, if on the tenth day (in the morning ) the number or oranges and grapefruits, on both trees, were exactly the same?