Please reason step by step, and put your final answer within \boxed{}.
At the arcade, Dave won 25 tickets initially and he spent 22 tickets on a beanie. However, to buy an additional keychain, he needs twice the number of remaining tickets after purchasing the beanie. Later, Dave won 15 more tickets. If there is a 10% discount on the keychain, how many tickets will he have left after buying both the beanie and the keychain?
user