I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers …
Here is the puzzles link : http://www.wuriddles.com/
Question : The mother is 21 years older than the child. In 6 years from now, the mother will be 5 times as old as the child. Question: Where’s the father?
My Solution : If you calculate the value of the age of the baby, you will get – 3/4 = – 0.75 = 9 months
This is derived from this equation :
27+x = 5 (x+6) => 27+x = 5x+30 => 4x = -3 => x = -3/4 = 9 months before the baby was born.
Hence the Father is with the Mother