expert Set 80 Form Exercise

? → [×2 + 1] → 19

Show answer

Answer: 9

SubType
find-input
Rule
×2 + 1
Input
9
Output
19
Difficulty
expert

? → [×3] → 15

Show answer

Answer: 5

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

? → [×2] → 8

Show answer

Answer: 4

SubType
find-input
Rule
×2
Input
4
Output
8
Difficulty
expert

Input: 10 → [×2] → ?

Show answer

Answer: 20

SubType
find-output
Rule
×2
Input
10
Output
20
Difficulty
expert

? → [×3] → 3

Show answer

Answer: 1

SubType
find-input
Rule
×3
Input
1
Output
3
Difficulty
expert

Input: 1 → [?] → 2, what is the rule?

Show answer

Answer: ×2

SubType
find-rule
Rule
×2
Input
1
Output
2
Difficulty
expert

Input: 9 → [?] → 27, what is the rule?

Show answer

Answer: ×3

SubType
find-rule
Rule
×3
Input
9
Output
27
Difficulty
expert

Input: 7 → [×3 - 2] → ?

Show answer

Answer: 19

SubType
find-output
Rule
×3 - 2
Input
7
Output
19
Difficulty
expert