You can measure 4 liters of liquid using these two methods:
Method 1
- First, you fill up the 5 liter bucket and pour 3 liters out of it into the 3 liter bucket. You now have 2 liters in the 5 liter bucket.
- Empty the 3 liter bucket.
- Pour the 2 liters into the now empty 3 liter bucket.
- Next, fill up the 5 liter bucket and pour 1 liter out of it into the 3 liter bucket in order to fill up this container.
- Finally, the larger bucket now contains exactly 4 liters!
Method 2
- Fill up the 3 liter bucket and pour these 3 liters into the 5 liter container.
- Fill the 3 liter bucket again and pour 2 liters of it into the 5 liter bucket.
- Empty the 5 liter container and pour the 1 liter which remains in the 3 liter bucket into the 5 liter bucket.
- Fill up the 3 liter container and pour these 3 liters into the 5 liter container.
- Finally, the larger bucket now contains exactly 4 liters!