The mom is 21 years older than the child. In 6 years from now the mom will be 5 times as old as the child.
Question : Where's the father?

Answer:
The mom is 21 years older than the child.
M = C + 21
In 6 years from now the mom will be 5 times as old as the child.
M + 6 = (C + 6) 5.
Hence, C + 21 + 6 = (C + 6) x 5
C + 27 = 5C + 30
-3 = 4C
C = -3/4 = -9 months.
The child is -3/4 years old, it'll be born in 9 months."
So right now, the father is on top of the MOTHER!!"