How many boxes are there between Box D and Box G?

Box E is placed in even numbered rack above the rack three. Box Z is placed immediately below Box E. Only three boxes are placed between Box Z and Box G. Only one box is placed between the Box G and Box D. Box F is placed immediately above Box D. Box B is not placed above Box A. Neither Box A nor Box B is placed in lowermost rack. From above statements, Box E is placed either in 4th or 6th rack (two possibilities) Remaining statements are given directly; by using we get the completed table in Case-2 Case-1 gets eliminated, as it violates the last reference point