function-machine/addition/hard · Set 75

8 problems
1
Input: 6 → [?] → 15, what is the rule? =
2
? → [×2 + 3] → 9 =
3
? → [×2 + 3] → 23 =
4
? → [+4 ×2] → 12 =
5
? → [×2 + 1] → 19 =
6
? → [×3] → 30 =
7
? → [-3] → 6 =
8
Input: 5 → [×2] → ? =
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