math
posted by treshia .
Ms. Jacobs is planning to put a fence around a rectangular part of her yard. She wants the area of the yard inside the fence to be 216 square feet. The fenced part of her yard has a length of 18 feet. Ms. Jacobs wants to put a 3foot iron gate on one side of the fenced yard. How many feet of fencing does she need for the rest of the fenced yard? Please show me how to get the correct answer for this.

216/18 = 12, so the yard is 12x18, making the perimeter 60 feet.
So, without the gate, she needs 57 feet of fence.