function-machine/multiplication/medium · Set 59

8 problems
1
Input: 3 → [?] → 9, what is the rule? =
2
? → [×5] → 10 =
3
? → [-1] → 7 =
4
Input: 4 → [?] → 20, what is the rule? =
5
Input: 5 → [+2] → ? =
6
? → [+4 ×2] → 20 =
7
Input: 8 → [-1] → ? =
8
? → [×3 - 2] → 19 =
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