Another Container Question!?

Question

You have a graduated, cylindrical measuring glass with a mazimum capacity of 250ml. All the marks have worn off except the 150 ml and 50 ml marks. You also have a unmarked container. How do you fill the unmarked container with exactly 350 ml in only two measurements?

Thanks,
Rosefern

Answer 1

1. Fill the marked cylinder with 150 ml of water and pour the contents into the unmarked cylinder.
2. Pour 50 ml from the unmarked cylinder into the marked one. This leaves 100 ml of water in the unmarked cylinder.
3. Fill the marked cylinder all the way and pour the contents into the unmarked cylinder. The 250 ml from the marked cylinder and the 100 ml already in there gives you 350 ml.

Of course, this assumes that your marked cylinder is larger than 350 ml (it'd be trivial if it were exactly 350 ml).