5 drainage pipes , each draining water from a pool at the same constant rate , together can drain a certain pool in 12 days . how many additional pipes q , each draining water at the same constant rate , will be needed to drain the pool in 4 days ?
n0 = 5.0
n1 = 12.0
n2 = 4.0
t0 = n0 * n1
t1 = t0 / n2
answer = t1 - n0
print(answer)