function-machine/division/hard · Set 75

8 problems
1
Input: 2 → [?] → 7, what is the rule? =
2
Input: 10 → [+2] → ? =
3
? → [+4 ×2] → 10 =
4
Input: 7 → [?] → 4, what is the rule? =
5
Input: 3 → [?] → 7, what is the rule? =
6
Input: 1 → [×2 + 3] → ? =
7
? → [+5] → 6 =
8
Input: 10 → [?] → 15, what is the rule? =
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