CDS Model Paper 3 Mathematics

A, B, C and D play a game of cards. A says to B. 'If I give you 8 cards, you will have as many as C has and I shall have 3 less than what C has. Also if I take 8 cards from C,1 shall have twice as many as D has. If B and D together have 50 cards, how many cards has A got?