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I steal the other's math and add some detail. It will be at least 23 floppy disks.

Why at least, it depends on the data and the size of files you are storing.

If you right to the disk in raw format, then the others are correct. You will use up 23 floppies (last one not full).

If, however, these are stored as multiple files then it will grow. All disks have an allocation factor, the minimum size allocated. Assume that the factor is 1024 b on a floppy. If one file is 1 byte, it will still take up 1024 B. Same as a file that is 1000 bytes. A file that is 1026 bytes will occupy 2048 bytes on the disk.

I know this is not what your teacher was looking for but it will be an interesting reply when you say, at least 23 floppies.

I just checked and the allocation unit for a 1.44 MB floppy was 512 bytes. So, a 750 byte file will occupy 1024 bytes of space on a disk.