47.
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 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?
The answer is:
A
