how many scales are there in piano or any musical instrument?

Answer 1

12 scales of each kind. The scales would be determined by the root note, and what type of scale it is.
(A, A#, B, etc.) (major, minor, dorian, mixolydian, etc.)

Answer 2

the same thing stephen b said only there is no such thing as A # major because that would make it b flat major

Answer 3

one for every key