2
10 ○ 1 11, what is ○? =
4
8 ○ 10 80, what is ○? =
10
2 ○ 5 10, what is ○? =
11
8 ○ 2 10, what is ○? =
13
54 ○ 9 6, what is ○? =
16
7 ○ 5 35, what is ○? =
17
10 ○ 2 8, what is ○? =
18
13 ○ 8 5, what is ○? =
19
9 ○ 5 14, what is ○? =
20
8 ○ 5 40, what is ○? =