calculate the average of all the numbers between 10 and 86 which are divisible by 9 .
import math
n0 = 10.0
n1 = 86.0
n2 = 9.0
t0 = n0 / n2
t1 = n1 / n2
t2 = math.floor(t0)
t3 = math.floor(t1)
t4 = t2 + 1.0
t5 = t4 + t3
t6 = t5 / 2.0
answer = n2 * t6
print(answer)