Jessica has 8 1/7 pounds of dog food. Feeds 1/7 pound per day. How many days will dog food last?

(57/8) / (1/7)

(57/8) * 7 = 399/7 = 57

To determine how many days Jessica's dog food will last, we need to divide the total amount of dog food by the amount she feeds per day.

Jessica has 8 1/7 pounds of dog food, which can be written as an improper fraction: 57/7 pounds.

Now we divide the total amount of dog food (57/7 pounds) by the amount she feeds per day (1/7 pound):

(57/7) ÷ (1/7) = 57/1 = 57

Therefore, the dog food will last for 57 days.