How many persons are sitting between T and F when counted from the left of T?

We have,  J sits second to the left of U.  Only two persons are sitting between U and F. From the above condition, there are two possibilities Again we have,   Only one person sits between F and E.   E does not sit adjacent to U.   The number of persons sits between U and E is the same as the number of persons sit between U and K. Again we have,  The number of persons sits between J and F is one less than the number of persons sits between K and E, when counted to the right of both J and E respectively E sits exactly in the middle of A and F.  sits second to the right of A. From the above condition, case1 gets eliminated. Case 2 shows the final arrangement.