function-machine/subtraction/medium · Sada 72

8 problems
1
Input: 9 → [?] → 21, what is the rule? =
2
Input: 2 → [?] → 12, what is the rule? =
3
Input: 5 → [×2 + 3] → ? =
4
Input: 1 → [?] → 10, what is the rule? =
5
Input: 5 → [+2] → ? =
6
Input: 7 → [?] → 19, what is the rule? =
7
? → [×3] → 12 =
8
? → [×5] → 5 =
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