The area of a rectangular field is 1000 yd2.Two parallel sides are fenced
with aluminum at $15/yd. One of the remaining sides is fenced with
steel at $10/yd, and all but 10 yd of the remaining side is fenced with
wood costing $5/yd.The remaining 10 yd are left unfenced.The total
cost of the fencing is $1525.
a. What is the length of the side fenced with steel?
b. What is the length of each side fenced with aluminum?

Question

anonymous · Answer

rectangular perimeter: 2a + 2b

side a is the parallel ones,
so they're 2 in total
v
2 * a*$15/yd +      b*$10/yd + (b-10)*$5/yd                   = $1525
                               ^side b consists of steel
                                                 and of wood and open space