function-machine/subtraction/hard · Set 52

8 problems
1
Input: 3 → [?] → 8, what is the rule? =
2
Input: 6 → [×5] → ? =
3
? → [×5] → 15 =
4
Input: 6 → [+10] → ? =
5
? → [+5] → 7 =
6
? → [+4 ×2] → 14 =
7
Input: 9 → [+4 ×2] → ? =
8
Input: 10 → [?] → 20, what is the rule? =
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