Function Machines · Set 24

8 problems
1
Input: 9 → [×3] → ? =
2
Input: 8 → [?] → 13, what is the rule? =
3
? → [+5] → 13 =
4
Input: 6 → [?] → 8, what is the rule? =
5
Input: 5 → [?] → 7, what is the rule? =
6
Input: 7 → [?] → 6, what is the rule? =
7
Input: 4 → [?] → 1, what is the rule? =
8
Input: 6 → [×3] → ? =
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