17). Each number is changed by the same rule inside this number changer. Given these four numbers and their result, find the rule.




Answer:____________

18). You are a spy trying to break an enemy code. You broke into their computer and found these equations:
3 & 5 = 14,
1 & 4 = 7,
6 & 3 = 21.
What is 2 & 12?

Answer:____________

19). If 1 @ 3 = 6 and
7 @ 4 = 25 and
5 @ 8 = 23,
what is 12@11?

Answer:____________