   SEARCH HOME Math Central Quandaries & Queries  Question from Jennifer, a parent: A Farmer's pasture measures 100 feet by 108 feet. Each cow needs 4 square yards of pasture to have enough grass. How many Cows should the farmer put in this pasture? If he builds a fence around the pasture 5 feet inside the edge, how much fencing would he need? Does this change the number of cows that can be kept in the pasture? If so, why ? PLease help me Hi Jennifer,

The pasture has an area of 100 × 108 = 10,800 square feet. Each cow needs 4 square yards of pasture and there are 3 feet in a yard so 4 yards2 = 4 (3 feet)2 = 4 × 32 feet2 = 36 square feet. How many 36 square feet regions are there in 10,800 square feet?

Draw a diagram for the next part. The brown fence is 5 feet inside the boundaries on each side and gives a new pasture area that is L feet long by W feet wide. How long is L? How long is W? What is the area L × W of the smaller pasture? How many 36 square feet regions are there in this smaller pasture?

Penny     Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.