yes you can, but that doesn't mean that it's the best solution. the best way is to remove the old tile. period.
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It is best to remove the wall tiles. You need a flat service and a lot of times old tile will not be perfectly flat. If you remove the tiles you will have a good base to tile on. If you don't want to remove the tiles you may be able to add a backer board on top of the old tile and then tile on that.
I wouldn't recommend it. Most wall tiles are very smooth and wouldn't have any grit for the thin-set to adhere to.
I have tiled over cork tiles with ceramic tiles and it worked fine in a bathroom, around a bath. If the current tiles are really well fixed it should be fine.
It is possible but I would not reccomend it. If possible remove the old tile before laying the new tile. If you want to avoid removing the old tile you can lay a cement board over the old tile before installing the new tile.
You will need 47 tiles.