Answer Number 6: Take the following steps:
- Fill the 5-gallon container
- Pour the water from the 5-gallon container into the 3-gallon container. (2 gallons remain in the 5-gallon container)
- Empty the 3-gallon container.
- Pour the 2 gallons from the 5-gallon container into the 3-gallon container
- Fill the 5-gallon container.
- Finally, pour the water from the 5-gallon container into the 3-gallon container until it is full, and you are left with exactly 4 gallons in the 5-gallon
Answer Number 7: He will plant the trees in a five-point star formation
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