Seven boxes viz. A, B, C, D, E, F and G are kept one above other. How many boxes are kept below box G? Statement I: Box C is kept third from top. Box D and F are kept together. Box E, which is neither kept adjacent to box F nor box
C. Only three boxes are kept between D and
C. Box A, which is not kept adjacent to box B, is kept at any place above box G. Statement II: Only three boxes are kept between box F and A, which is kept second from top. Box B, which is neither kept adjacent to box A nor box F, is kept just below box
C. Only three boxes are kept between box D and box
C.

We have: From Statement I: We have:  Box C is kept third from top. Only three boxes are kept between D and C, that means box D is kept at bottom. Box D and F are kept together, that means box F is kept second from bottom.Box E, which is neither kept adjacent to box F nor box C, that means box E is kept at top.  Box A, which is not kept adjacent to box B, is kept at any place above box G, that means box A is kept just below box E. Based on above given information we have Clearly, we don’t know exact position of box G. Hence, statement I is not sufficient. From Statement II: We have: Only three boxes are kept between box F and A, which is kept second from top, that means box F is kept second from bottom. Box B, which is neither kept adjacent to box A nor box F, is kept just below box C, that means box C is kept just below box A.  Only three boxes are kept between box D and box C, that means box D is kept at bottom. Based on above given information we have Clearly, only two boxes are kept below box G. Hence, statement I and II together sufficient.