at a certain restaurant , the average ( arithmetic mean ) number of customers served for the past x days was 65 . if the restaurant serves 120 customers today , raising the average to 90 customers per day , what is the value of x ?
n0 = 65.0
n1 = 120.0
n2 = 90.0
t0 = n1 - n2
t1 = n2 - n0
t2 = n1 - 100.0
t3 = t0 / t1
t4 = t2 / 100.0
answer = t3 - t4
print(answer)