Question 177392
we can figure out what it would take to feed 4 dogs for 1 day by dividing 
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8pounds/3days=8/3 of a pound per day to feed 4 dogs
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now if we were feeding 12 dogs instead of 4 that would be 3 times as much food per day  because we are talking about 3 times as many dogs. (8/3)(3)=8pounds per day for 12 dogs.
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we need to feed these 12 dogs for 7 days so we multiply our 8 pounds per day by the number of days.
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8(7)=56 pounds of food