If my dog eats 1 7/8 pounds of food every day, how long will a 25 pounds bag of dog food last me? ( write answer as a mixed number)?

Turn 1 7/8 into an improper fraction:15/8

Find a common denominator between 25 (25/1) and 15/8:
25/1 (8) = 200/8
15/8 (stays the same)

First find how many times 15 can fit into 200, which is 13 times then subtract:
200/8 - 195/8 = 5/8

13 5/8