You would be better of removing the plywood floor completely - and tiling over the original surface.
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You couldn't tile directly over a plywood sub-floor because over time, the wood will be expanding. There are products you can use in between the plywood and tiles to keep them in place such as cement backer board.
can you mix ceramic and porcelain tile on a bathroom floor
No, plywood alone is not strong enough for ceramic tile. These floors require a very sturdy subfloor at least 1 1/4" thick before the tile. This requires either using cement board or a pored mudbed.
Generally, in the 4'-5' from floor range.
If you are installing a floating laminate floor, you can easily put it right over the tile.