A, B, C and D play a game of cards. A says to B, “If | give you 8 cards, you will have as many as C has and | shall have 3 less than what C has. Also, if  I take 6 cards from C, I shall have twice as many as D has.” If B and D together have 50 cards, how many cards has A got?

A

40

B

37

C

27

D

23