Medium · Set 42

8 problems
1
Input: 4 → [?] → 8, what is the rule? =
2
? → [×2] → 18 =
3
? → [+10] → 15 =
4
Input: 7 → [+4 ×2] → ? =
5
Input: 10 → [-3] → ? =
6
Input: 8 → [×2] → ? =
7
Input: 1 → [×5] → ? =
8
? → [×2] → 4 =
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