I am sure my classmates will bear away my statement.

In a queue I am the last person while my friend is Seventh from the front. If the person exactly between me and my friend is on the 23^(rd) position from the front, what is my position in the queue?

I am three times as old as my son. Five years later, I shall be two and a half times as old as my son. How old am I and how old is my son?

My age is four xx the difference of my age after four years and my age three years back. How old I am?

My age is four times the difference of my age after four years and my age three years back. How old I am?