the sum of the present ages of a father and his son is 42 years . 6 years ago , father ' s age was 4 times the age of the son . after 6 years , son ' s age will be :
n0 = 42.0
n1 = 6.0
n2 = 4.0
n3 = 6.0
t0 = n2 + 1.0
t1 = n1 * n2
t2 = t1 - n1
t3 = n0 + t2
t4 = t3 / t0
answer = n1 + t4
print(answer)