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Two penguins and two puffins are all standing together on the edge of an iceberg and wish to cross to the opposite side to get to the other iceberg. They have a rowboat. Due to the weight capacity of the boat, they can only cross in groups of only 2 puffins or only 1 penguin. In order to get all four animals to the opposite side, what is the minimum number of times the rowboat must cross the sea if at least one penguin or puffin must be in the boat during each crossing?

 

 Jan 9, 2020
 #1
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Cross with two puffins

   come back with ONE puffin

      cross with one penguin

         take the puffin back

           cross with two puffins

             take one puffin back

               cross with second penguin

                 take one puffin back

                   cross with two puffins

                      get a new boat     

 Jan 9, 2020

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