* Carla and Diane have started a pet sitting company. They have a 25 pound bag of food. There are 13 dogs. If each
dog eats 1/3 of a pound, how much dog food would be left?
The dogs would consume a total of 13 * 1/3 = <<13*1/3=4 1/3>>4 1/3 pounds of dog food.
Thus, 25 - 4 1/3 = <<25-4.333=20.667>>20.667 pounds of dog food would be left. Answer: \boxed{20.667}.