You have a 3-gallon bucket and a 5-gallon bucket, how do you measure out exactly 4 gallons?

• Fill the 5 gallon bucket.
• Fill 3 gallon bucket from 5gallon bucket.
• Empty 3 gallon bucket.
• Fill the remaining 2 gallons from the 5 gallon into the 3 gallon bucket.
• Fill the 5 gallon bucket again.
• Fill the 3 gallon bucket from the 5 gallon bucket.

Sir, your 5 gallon bucket will have 4 gallon water.