How many extra doughnuts did I eat if I finished a box in 4 days?

[julian]

I buy a box of 7 doughnuts and intend to eat 1 a day starting on say a Friday. Say I get greedy and eat all 7 doughnuts by the end of Tuesday and then buy another box of doughnuts and eat 1 a day starting from the Wednesday. How many extra doughnuts have I eaten during the 7 day period starting on the Friday?

 

[HallsofIvy]

So you ate 7 doughnuts through Tuesday and then ate one on Wednesday and one on Thursday. That's a total of 7+ 2= 9 doughnuts in 7 days. Why did you have any doubt about this?