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Measuring water

 

If you had an infinite supply of water and a 5 gallon and 3 gallon bucket, how would you measure exactly 4 gallons?

 

 

 

 

 

 

 

 

 

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Answer:

                        5          3

Fill up 3            0          3

Tip into 5          3          0

Fill up 3             3          3

3 to 5                5          1

Tip out 5           0          1

3 to 5                1          0

Fill up 3            1    +    3 = 4

 

 


Difficulty
    • Moderate
      Type
        • Logic
        • Mathematical


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          Comments

          ithink different: let keep 5 gallon bucket as A adn other bucket B

          fill up A and pour it on B
          there will be 2 gallons left

          and repeat once more

          u will have agian 2 gallons left
          and there u go 4 gallons

          - (17 May 2009)

          Put water 1/2 of 5=2.5 gal
          Put water 1/2 of 3=1.5 gal
          Total =4.0 gal
          - Nan Nwe Nwe (28 Jul 2009)

          Fill both buckets and freeze them then measure the difference that will equal 2 gallons double the distance and and u have four once thawed u will know how deep 4 gallons will be
          - Kurt (24 Aug 2009)

          lol @ the silliness of comments... what if the jugs are shaped like milk jugs and have irregular shape.

          A more efficient way:
          Fill up 5 gallon jug and pour it into 3 gallon jug. 2 gallons left.
          Pour out the 3 gallon jug and pour 2 gallons into the 3 gallon jug.
          Fill up the 5 gallon jug and pour enough to fill up the 3 gallon jug (it has space for 1 more gallon). You will have 4 gallons left in the 5 gallon jug.
          - kevin (13 Nov 2009)

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