How many persons are sitting between D and C when counted from the left of D?

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