Question 666198
Let a,b,c be the sides in increasing length.

a+b+c = 96 since the perimeter is 96.

c = 2a

and b = c-4

a = c/2

b = c-4

c = c

c/2 + c-4 + c = 96

c + 2c-8 +2c = 192  (getting rid of the fraction)

5c -8 = 192

5c = 200

c = 40

a = c/2 so  a = 20

b = c-4 so c = 36


The sides are 20,36,40, which if you notice add up to 96.