Medium · Set 92

8 problems
1
Input: 9 → [?] → 19, what is the rule? =
2
Input: 2 → [×2] → ? =
3
? → [×5] → 25 =
4
? → [×5] → 5 =
5
Input: 8 → [?] → 10, what is the rule? =
6
Input: 4 → [?] → 8, what is the rule? =
7
? → [×2 + 3] → 17 =
8
? → [+4 ×2] → 20 =
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