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2015-10-06T01:43:47+05:30

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We have a container which we fill 9 gallon of water.

  Take 7 gallon full of water,  pour in to  the 11 gallon.  Take again 7 gallons with the 7 gallon container, pour into the 11 gallon container, till it is full.  So 3 gallons are remaining in it now.    Pour it into our container, where you want  9 gallons.

  Empty the 11 gallon container.  Repeat the above procedure two more times.
  Then you get  9 gallons.
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