(Solved): A fence is to be built to enclose a rectangular area of 230 square feet. The fence along three side ...

A fence is to be built to enclose a rectangular area of 230 square feet. The fence along three sides is to be made of material that costs 5 dollars per foot, and the material for the fourth side costs 15 dollars per foot. Find the dimensions of the enclosure that is most economical to construct. Dimensions: $\mathrm{x}$