The key of A-flat major contains four flats: B, E, A, and D.
There are two flats in the key of B flat major: B flat and E flat.
7
The key of E-flat major contains three flats: Bb, Eb, and Ab.
2 flats B-flat and E-flat
5 b flat, e flat, a flat, d flat, and g flat
Two flats, B flat and E flat
Such a key only exists in theory. C major has zero flats. C-flat major has 7 flats. C-double-flat major would have 14 flats.
It depends on which key you are referring to, all the keys with flats are: F major (1 flat) B-flat major (2 flats) E-flat major (3 flats) A-flat major (4 flats) D-flat major (5 flats) G-flat major (6 flats) C-flat major (7 flats) Likewise the relative minors are: D minor (1 flat) G minor (2 flats) C minor (3 flats) F minor (4 flats) B-flat minor (5 flats) E-flat minor (6 flats) A-flat minor (7 flats)
The key of A flat major has four flats: B flat, E flat, A flat and D flat.
There are two flats in the key of B flat major: B flat and E flat.
Cb major has all 7 flats
There are three flats in the key signature of E flat major
There are two flats, B flat and E flat. It is the relative minor for B flat Major.
E Flat Major has 3 G Flat Major has 6
7
The key of E-flat major contains three flats: Bb, Eb, and Ab.
2 flats B-flat and E-flat