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To determine which dog will eat more food per day, we need to calculate the rate at which each dog consumes food.
For Bingo, who finishes a 15-lb bag of food in 10 days, his rate of consumption is 15 lbs / 10 days = 1.5 lbs per day.
For Buddy, who finishes a 20-lb bag of food in 16 days, his rate of consumption is 20 lbs / 16 days = 1.25 lbs per day.
Therefore, Bingo will eat more dog food per day at a rate of 1.5 lbs.