From Presh Talwalkar here is a variation of the three jugs problem.

“You have buckets that hold 3 L, 7 L, and 20 L of water. How can you measure the following amounts?

1. a) 10 L
2. b) 4 L
3. c) 5 L

For most of mathematical history the above information would be sufficient information to state the problem. But in today’s society, there is a demand to state all assumptions as if that will make the problem better. So the test explained there are certain actions you can take.

You can fill any bucket completely with water. You can pour all the water from a bucket into a larger bucket. You can pour water from a bucket to fill a smaller bucket. You can empty the water completely from any bucket.”

See the Three Buckets Question for solutions.