The base of an isosceles triangle is half the length of each of its congruent sides.
if the perimeter of the triangle is 120 inches, what is the length of the base?
a.
16 inches
b.
24 inches
c.
6 inches
d.
12 inches

i suppose it should be (y=2x-5)

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.