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To determine which dog will eat more dog food per day, we need to calculate the amount of dog food that each dog eats per day.
For Bingo:
Bingo eats a 15-lb. bag of dog food in 10 days. So, Bingo eats 15/10 = 1.5 lb. of dog food per day.
For Buddy:
Buddy eats a 20-lb. bag of dog food in 16 days. So, Buddy eats 20/16 = 1.25 lb. of dog food per day.
Therefore, Bingo will eat more dog food per day at a rate of 1.5 lb. per day.