Question

You have two unmarked containers, a 9-liter container and a 4-liter container, and an unlimited supply of water. Explain how you would get an exact measurement of 3-liters with the given equipment.

Answer 1

1.Fill the four liter bottle with water first.
2. pour the four liter bottle into the nine liter making the four liter bottle empty and having 4/9 in the other
3.Refill the four liter bottle
4. Pout the four liter bottle into the nine making the four again empty and the nine have 8/9
5. refill the four liter one last time.
6. Finish filling the nine liter with water from the four liter. Making the nine liter full and the four 3/4th full leaving 3 liters in the bottle.