Seven boxes - I, J, K, L, M, N and O are kept one above the other, but not necessarily in the same order. Each box contains different items viz., Books, Bottles, Chargers, Keys, Pens, Stamps and Scales.
Box K, which contains Bottles, is kept exactly in the middle of the stack.
The number of boxes arranged above box M is twice the number of boxes arranged below box M.
| Sr. no | Boxes | Items |
| 1 | | |
| 2 | | |
| 3 | | |
| 4 | K | Bottles |
| 5 | M | |
| 6 | | |
| 7 | | |
Box of Stamps is kept neither above box K nor below the box which contains Chargers.
| | Case 1 | | Case 2 | | Case 3 | |
| Sr. no | Boxes | Items | Boxes | Items | Boxes | Items |
| 1 | J/L | | J/L | | J/L | |
| 2 | | | | | | |
| 3 | | | | | | |
| 4 | K | Bottles | K | Bottles | K | Bottles |
| 5 | M | Stamps | M | | M | |
| 6 | | Chargers | | | | Stamps |
| 7 | | | | Chargers | | Chargers |
Box of Pens is kept immediately above the box of Keys.
Either box J or L is kept at the topmost position.
| | Case 1 | | Case 2 | | Case 3 | |
| Sr. no | Boxes | Items | Boxes | Items | Boxes | Items |
| 1 | J/L | Pens | J/L | Pens | J/L | Pens |
| 2 | | Keys | | Keys | | Keys |
| 3 | | | | | | |
| 4 | K | Bottles | K | Bottles | K | Bottles |
| 5 | M | Stamps | M | | M | |
| 6 | | Chargers | | | | Stamps |
| 7 | | | | Chargers | | Chargers |
| | Case 1a | | Case 2a | | Case 3a | |
| Sr. no | Boxes | Items | Boxes | Items | Boxes | Items |
| 1 | J/L | | J/L | | J/L | |
| 2 | | Pens | | Pens | | Pens |
| 3 | | Keys | | Keys | | Keys |
| 4 | K | Bottles | K | Bottles | K | Bottles |
| 5 | M | Stamps | M | | M | |
| 6 | | Chargers | | | | Stamps |
| 7 | | | | Chargers | | Chargers |
Keys are kept below box I. Thus, case 1, case 2 and case 3 are invalid.
| | Case 1a | | Case 2a | | Case 3a | |
| Sr. no | Boxes | Items | Boxes | Items | Boxes | Items |
| 1 | J/L | | J/L | | J/L | |
| 2 | I | Pens | I | Pens | I | Pens |
| 3 | | Keys | | Keys | | Keys |
| 4 | K | Bottles | K | Bottles | K | Bottles |
| 5 | M | Stamps | M | | M | |
| 6 | | Chargers | | | | Stamps |
| 7 | | | | Chargers | | Chargers |
Three boxes are kept between boxes N and O.
Box O contains neither Keys nor Chargers. Thus, case 2a and case 3a are invalid.
| | Case 1a | |
| Sr. no | Boxes | Items |
| 1 | J/L | |
| 2 | I | Pens |
| 3 | N | Keys |
| 4 | K | Bottles |
| 5 | M | Stamps |
| 6 | | Chargers |
| 7 | O | |
Scales are not kept below box L.
| | Case 1a | | Case 1a.a | |
| Sr. no | Boxes | Items | Boxes | Items |
| 1 | J | Scales | L | Scales |
| 2 | I | Pens | I | Pens |
| 3 | N | Keys | N | Keys |
| 4 | K | Bottles | K | Bottles |
| 5 | M | Stamps | M | Stamps |
| 6 | L | Chargers | J | Chargers |
| 7 | O | Books | O | Books |
Box J is not kept immediately above Books.
So, case 1a.a is invalid.
Therefore, the final arrangement is:
| Sr. no | Boxes | Items |
| 1 | J | Scales |
| 2 | I | Pens |
| 3 | N | Keys |
| 4 | K | Bottles |
| 5 | M | Stamps |
| 6 | L | Chargers |
| 7 | O | Books |
Except (e), in all other options, two items are arranged between the mentioned box and item.
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