Water measure puzzle
- Fill the 3-liter bottle and pour it into the empty 5-liter bottle.
- Fill the 3-liter bottle again, and pour enough to fill 5-liter bottle. This leaves exactly 1 liter in the 3-liter bottle.
- Empty the 5-liter bottle; pour the remaining 1 liter from the 3-liter bottle into the 5-liter bottle.
- Fill the 3-liter bottle and pour it into the 5-liter bottle. The 5-liter bottle now has exactly 4 liters.
Here is another way to do it*
- Fill the 5-liter bottle and pour water from it into the 3-liter bottle until it is full.
This leaves 2 liters in the 5-liter bottle.
- Empty the 3-liter bottle and pour the 2 liters of water from the 5-liter bottle into the 3-liter bottle.
- Fill the 5-liter bottle again.
- Fill the 3-liter bottle from the 5-liter bottle. Since the 3-liter bottle had 2 liters of water, only one liter is transferred leaving exactly 4 liters of water in the 5-liter jug.
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