Brain Teasers: Answers...
Fellow bloggers Diamond Geezer and Dave were both right.
1. 23 cards are missing. Making 29 left from the pack of 52. 9s into 29 go 3 leaving 2. 4s into 29 go 7 leaving 1. It was a tough rubber.
2. And that lard arse, Betty, ate 40 doughnuts in her final sitting. 1st sittings 22 x 10 = 220; Overall sittings 30 x 34 = 1020; So 2nd sittings was 1020-220 = 800; Making each sitting 800 / 20 = 40