SOLUTION: You can feed 6 puppies or 2 dogs with 1 can of food. If you have 10 cans and feed 21 puppies. How many dogs can you feed with the remaining food?

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Question 735993: You can feed 6 puppies or 2 dogs with 1 can of food. If you have 10 cans and feed 21 puppies. How many dogs can you feed with the remaining food?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +p+ = number of puppies
Let +d+ = number of dogs
( 6p ) / ( 1 can ) = ( 2d ) / ( 1 can )
or
( 1 p ) / ( 1/6 can ) = ( 1 d ) / ( 1/2 can )
---------------------
+21p+%2F+%28+21%2F6+%29+=+d+%2F+%281%2F2%29+
+10+-+21%2F6+=+20%2F2+-+7%2F2+
+13%2F2+ cans are left
+%2813%2F2%29%2A%28+d+%2F+%281%2F2%29+%29+=+13d+
13 dogs can be fed with remaining 6.5 cans
check:
( 1 p ) / ( 1/6 can ) = ( 1 d ) / ( 1/2 can )
( 21p / ( 7/2 can ) = ( 13d ) / ( 13/2 can )
( 6p ) / ( 1 can ) = ( 2d ) / ( 1 can )
OK