guys seen this one? its an old one math question per say. but sense it deals with water on a fish site.
you have a 5 gallon can, and a 3 gallon can.
you are by a lake. you need to get exactly 4 gallons in the 5 gallon can.
you can fill and empty them as many times as you like.
1)You fill the 3 gallon...pour it into the 5 gallon
2)you fill the 3 gallon again...pour it into the 5 gallon until it's full.
3)you dump the 5 gallon...pour the rest of the 3 gallon into the now empty 5 gallon(which is 1 gallon of water)
4)You fill the 3 gallon... pout it into the 5 gallon and you now have 4 gallons