Question

a rectangular lot whose perimeter is 310 is fenced along three sides. an expensive fencing along the lot’s length cost $24 per foot. An inexpensive fencing along the two sides widths costs only $4 per foot. the total cost of the fencing along the three sides comes to $3080. What are the lot’s dimensions?

Answer 1

l=115

w=40

Explanation:

let length=l

width=w

2(l+w)=310

l+w=155

l×24+2 w×4=3080

24 l+8w=3080

3l+w=385

subtract

3l+w-l-w=385-155

2l=230

l=115

115+w=155

w=155-115

or w=40

24 l+