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Question: There are 15 animals in the barn. Some are ducks and some are pigs . There are 46 legs in all. How many of each animal are there?

Question: There are 15 animals in the barn. Some are ducks and some are pigs. There are 46 legs in all. How many of each animal are there? 

I know the answer ( 7 ducks and 8 pigs) but I do not understand the way my instructor want me to do it.


2d + 4p = 46

d + p = 15

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