Mixed Medium · Set 56

7 problems
1
Input: 2 → [×3] → ? =
2
? → [-3] → 0 =
3
Input: 7 → [?] → 19, what is the rule? =
4
? → [+4 ×2] → 22 =
5
Input: 4 → [?] → 3, what is the rule? =
6
Input: 2 → [?] → 4, what is the rule? =
7
Input: 9 → [+5] → ? =
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