after a storm deposits 120 billion gallons of water into the city reservoir , the reservoir is 85 % full . if the original contents of the reservoir totaled 220 billion gallons , the reservoir was approximately what percentage full before the storm ?
n0 = 120.0
n1 = 85.0
n2 = 220.0
t0 = n0 + n2
t1 = n1 / 100.0
t2 = t0 / t1
t3 = n2 / t2
answer = t3 * 100.0
print(answer)