When the three layers are equal, each layer has: 192÷3=64 copies.

Before the lower layer is given to the upper layer,

The upper layer has: 64÷2=32 copies.

Yes: 64 middle-level books.

The lower layer has: 192-32-64=96 copies.

Before the middle layer is given to the lower layer,

The lower level has: 96÷2=48 copies.

There are: 32 books on the upper floor.

The middle layer is:192-48-32 =112 copies.

Before the upper layer is given to the middle layer, that is,

There are 1 12÷2=56 books in the middle layer.

There are: 48 books on the lower floor.

The upper layer has: 192-56-48=88 copies.