The question asks us to find how many more days is required for the animal to consume 91 pounds in total. So effectively we are asked to find how many days will the animal take to consume 91-39 = 52 pounds of food. We can setup a simple unitary method relationship approach to find the answer. So, the question is really asking If the animal consumes 39 pound of food in 6 days then how long does it take this animal consume 52 pounds of food at the same rate so the ans has to be E