How to measure 4 gallon of water

How to measure exactly 4 gallon of water from 3 gallon and 5 gallon jars, Given, you have unlimited water supply from a running tap.

It was also solved by Bruce Willis in one of his Die Hard movie to stop a bomb.

See Solution: How to measure 4 gallon water from 3 gallon and 5 gallon jar

There are 2 possible solutions i can think of

Solution 1:

  1. Fill 3 gallon jar with water.
  2. Pour all its water into 5 gallon jar.
  3. Fill 3 gallon jar again.
  4. Pour its water into 5 gallon jar untill it is full. Now you will have exactly 1 gallon water remaining in 3 gallon jar.
  5. Empty 5 gallon jar, pour 1 gallon water from 3 gallon jar into it. Now 5 gallon jar has exactly 1 gallon of water.
  6. Fill 3 gallon jar again and pour all its water into 5 gallon jar, thus 5 gallon jar will have exactly 4 gallon of water.

Solution 2:

  1. Fill 5 gallon jar.
  2. Pour all its water to 3 gallon jar, thus leaving exactly 2 gallon water in 5 gallon jar.
  3. Empty 3 gallon jar and pour all of 5 gallon jar water into it, thus now 3 gallon jar will have exactly 2 gallon of water.
  4. Fill 5 gallon jar again and pour its water to 3 gallon jar until that is full. So exactly 4 gallon water will remain in 5 gallon jar.

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  • Abhishek N

    First fill the 5 gallon and pour this to 3rd gallon capacity jar.. So remaining 2 gallons of water.. Now remove the water from 3rd gallon capacity jar.. And fill it with the remaining 2 gallon.. Then again fill the 5 gallon and make fill the 3 gallon jar… Remains 4 gallons!