2
21 ○ 4 25, what is ○? =
3
70 ○ 21 49, what is ○? =
5
20 ○ 4 24, what is ○? =
7
90 ○ 9 10, what is ○? =
11
40 ○ 10 4, what is ○? =
12
27 ○ 16 43, what is ○? =
13
90 ○ 42 48, what is ○? =
15
37 ○ 3 34, what is ○? =
16
2 ○ 10 20, what is ○? =
17
52 ○ 21 31, what is ○? =
19
21 ○ 7 3, what is ○? =
20
19 ○ 18 37, what is ○? =