You have an eight liter jug, a seven liter jug, a four liter jug, and an infinite supply of water. How do you get five liters of water into the eight liter jug?
1. Fill up the 7-liter jug completely.
2. Pour the water from the 7-liter jug into the 8-liter jug, leaving 1 liter of water in the 7-liter jug.
3. Fill the 7-liter jug again.
4. Pour the water from the 7-liter jug into the 8-liter jug, until it is full. This will leave exactly 2 liters of water in the 7-liter jug.
5. Empty the 8-liter jug completely.
6. Pour the remaining 2 liters of water from the 7-liter jug into the 8-liter jug.
7. Fill up the 4-liter jug completely.
8. Pour the water from the 4-liter jug into the 8-liter jug, until it is full. This will result in exactly 5 liters of water in the 8-liter jug.
Try again.
Apologies for the mistake in the previous response. Here is the correct solution:
1. Fill the 7-liter jug completely.
2. Pour the water from the 7-liter jug into the 4-liter jug until the 4-liter jug is full. This leaves 3 liters of water in the 7-liter jug.
3. Empty the 4-liter jug.
4. Pour the remaining 3 liters of water from the 7-liter jug back into the 4-liter jug.
5. Fill the 7-liter jug completely again.
6. Pour the water from the 7-liter jug into the 4-liter jug until the 4-liter jug is full. This will leave exactly 5 liters of water in the 7-liter jug.
7. Pour the 5 liters of water from the 7-liter jug into the 8-liter jug, giving you the desired 5 liters of water in the 8-liter jug.