when 3 is added to half of one - third of one - fifth of a number , the result is one - fifteenth of the number . find the number ?
n0 = 3.0
t0 = 2.0 + 3.0
t1 = t0 * 3.0
t2 = 1.0 / t1
t3 = t2 / 2.0
answer = n0 / t3
print(answer)