hard Set 71 Form Exercise

? → [+10] → 17

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Answer: 7

SubType
find-input
Rule
+10
Input
7
Output
17
Difficulty
hard

Input: 3 → [?] → 7, what is the rule?

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Answer: ×2 + 1

SubType
find-rule
Rule
×2 + 1
Input
3
Output
7
Difficulty
hard

? → [+4 ×2] → 16

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Answer: 4

SubType
find-input
Rule
+4 ×2
Input
4
Output
16
Difficulty
hard

? → [×2] → 18

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Answer: 9

SubType
find-input
Rule
×2
Input
9
Output
18
Difficulty
hard

? → [-1] → 3

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Answer: 4

SubType
find-input
Rule
-1
Input
4
Output
3
Difficulty
hard

Input: 8 → [-3] → ?

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Answer: 5

SubType
find-output
Rule
-3
Input
8
Output
5
Difficulty
hard

? → [×3 - 2] → 13

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Answer: 5

SubType
find-input
Rule
×3 - 2
Input
5
Output
13
Difficulty
hard

Input: 10 → [×3] → ?

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Answer: 30

SubType
find-output
Rule
×3
Input
10
Output
30
Difficulty
hard