My initial instinct was She would go with the highest number, but then I thought She would expect that so I guessed four. Of course She was one step ahead of me & predicted my reasoning. So it was five.

15 10

2 10

11 40

15 10

28 43

20 41

22 40

43 20

24 20

25 42

38 40

11 10

25 41

27 20

41 40

34 43