hard Set 84 Form Exercise

? → [×2 + 1] → 21

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Answer: 10

SubType
find-input
Rule
×2 + 1
Input
10
Output
21
Difficulty
hard

? → [+5] → 10

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Answer: 5

SubType
find-input
Rule
+5
Input
5
Output
10
Difficulty
hard

Input: 10 → [+5] → ?

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Answer: 15

SubType
find-output
Rule
+5
Input
10
Output
15
Difficulty
hard

Input: 3 → [×3] → ?

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Answer: 9

SubType
find-output
Rule
×3
Input
3
Output
9
Difficulty
hard

Input: 4 → [?] → 20, what is the rule?

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Answer: ×5

SubType
find-rule
Rule
×5
Input
4
Output
20
Difficulty
hard

Input: 6 → [?] → 20, what is the rule?

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Answer: +4 ×2

SubType
find-rule
Rule
+4 ×2
Input
6
Output
20
Difficulty
hard

? → [×3] → 15

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Answer: 5

SubType
find-input
Rule
×3
Input
5
Output
15
Difficulty
hard

Input: 1 → [?] → 3, what is the rule?

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Answer: ×3

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