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You have a five-gallon jug and a three-gallon jug. How can you measure exactly four gallons of water, using only these two jugs?
Hint: You don’t need any other equipment, and you don’t need to make any marks on the jugs.
So were you able to solve the riddle? Leave your answers in the comment section below.
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Answer & Explanation:
To measure exactly four gallons of water using only a five-gallon jug and a three-gallon jug, follow these steps:
- Fill up the five-gallon jug completely with water.
- Pour the water from the five-gallon jug into the three-gallon jug until the three-gallon jug is full. This leaves two gallons of water in the five-gallon jug.
- Dump out the water from the three-gallon jug, and pour the two gallons of water from the five-gallon jug into the three-gallon jug.
- Fill up the five-gallon jug completely with water again.
- Pour water from the five-gallon jug into the three-gallon jug until the three-gallon jug is full. Since there were already two gallons of water in the three-gallon jug from step 3, it will only take one more gallon of water to fill it up.
- This leaves exactly four gallons of water in the five-gallon jug.