Sam stores 10,656pounds of grain for his 24 cattle. Each cow eats about 12 pounds of grain each day. How many days would the food supply last?

Find out how many pounds the cattle eat per day (collectively):

24 cattle x 12 lb = 288 lb

Divide how much Sam has by how much the cattle eat per day:

10,656 lbs / 288 lbs per day = 37 days