How many cans of dog food must sam buy for his 3 dogs if each dog eats 2 cans per day? sam only shops once a week.

To find the answer you can set up an equation like this: 3(x)(d) 
x would stand for number of cans each dog eats, while d stands for the number of days in a week. 3(2)(7)=42 Sam would have to purchase 42 cans of dog food each week. 

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