1. ALGEBRA Number Walls

2. 12 3 8 9 15 11 17 26 28 54

3. 11 13 5 6

4. 11 13 5 6 24 28 11

5. 13 5 6 24 28 11 52 39

6. 11 13 5 6 24 28 11 52 39 91

7. 7 14 32 59

8. 7 14 32 27 59

9. 7 13 14 32 27 59

10. 7 6 19 13 14 32 27 59

11. 12 7 6 8 19 13 14 32 27 59

12. N 3 12 1 51

13. N 3 12 1 N + 3 15 13 51

14. N 3 12 1 N + 3 15 13 N +18 28 51

15. N 3 12 1 N + 3 15 13 N +18 28 N + 46 = 51

16. N = 5 3 12 1 8 15 13 23 28 51

17. missing number 3 One less than missing number 7 33

18. N 3 N - 1 7 33

19. N 3 N - 1 7 N + 3 N + 2 N + 6 33

20. N 3 N - 1 7 N + 3 N + 2 N + 6 2N + 5 2N + 8 33

21. N 3 N - 1 7 N + 3 N + 2 N + 6 2N + 5 2N + 8 4N + 13 = 33

22. N 3 N - 1 7 N + 3 N + 2 N + 6 2N + 5 2N + 8 4N + 13 4N + 13 = 33 4N = 20 N = 5