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Situation:- Calling all maths geniuses to try this...
A mother is 21 years older than the child. 6 years from now the mother will be 5 times as old as the child.



Question:- Where's the father?



check the post below for solution :p

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Solution:-

The mother is 21 years older than the child.

M = C + 21..............(i)

In 6 years from now the mum will be 5 times as old as the child.

M + 6 = (C + 6) x 5.......(ii)

Hence,

putting in the value of M from equation (i) in equation(ii)

C + 21 + 6 = (C + 6) x 5

C + 27 = 5C + 30

-3 = 4C

C = -3/4

The child is -3/4 years old, that is, it'll be born in 9 months.
Thus.. by mathematical induction....
Right now, the father is on top of the mother... :p