Medium · Set 50

8 problems
1
Input: 5 → [?] → 11, what is the rule? =
2
Input: 9 → [?] → 21, what is the rule? =
3
? → [+10] → 12 =
4
Input: 9 → [?] → 8, what is the rule? =
5
Input: 2 → [×5] → ? =
6
Input: 5 → [?] → 2, what is the rule? =
7
Input: 4 → [?] → 14, what is the rule? =
8
Input: 4 → [?] → 16, what is the rule? =
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