If you have a 3-gallon and 5-gallon jug, how do you measure exactly 4 gallons?
Fill 5, pour into 3, refill 5, pour into 3
The answer
Fill 5, pour into 3 (leaves 2 in 5). Empty 3. Pour 2 into 3. Fill 5. Pour into 3 (needs 1). Left with 4 in the 5-gallon.
Source: Verified
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