Task: Question Answering
Input (English): Question: A gambler has won 40% of his 40 poker games for the week so far. If, all of a sudden, his luck changes and he begins winning 70% of the time, how many more games must he play to end up winning 60% of all his games for the week?

 Option A: 50

 Option B: 60

 Option C: 70

 Option D: 80

 Option E: 90
Output (English): Option D