starter Set 55 Form Exercise

? → [+5] → 13

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Answer: 8

SubType
find-input
Rule
+5
Input
8
Output
13
Difficulty
starter

? → [×2] → 18

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Answer: 9

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

? → [-3] → 2

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Answer: 5

SubType
find-input
Rule
-3
Input
5
Output
2
Difficulty
starter

Input: 5 → [?] → 4, what is the rule?

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Answer: -1

SubType
find-rule
Rule
-1
Input
5
Output
4
Difficulty
starter

? → [×3] → 18

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Answer: 6

SubType
find-input
Rule
×3
Input
6
Output
18
Difficulty
starter

Input: 10 → [-1] → ?

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Answer: 9

SubType
find-output
Rule
-1
Input
10
Output
9
Difficulty
starter

? → [-1] → 4

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Answer: 5

SubType
find-input
Rule
-1
Input
5
Output
4
Difficulty
starter

? → [-1] → 8

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Answer: 9

SubType
find-input
Rule
-1
Input
9
Output
8
Difficulty
starter