2 : 8, 3 : 18, 5 : ___
50 (left squared x 2 = right) MULTI-STEP
3 : 9, 5 : 25, 7 : ___
49 (left squared = right)
8 : 16, 5 : 10, 12 : ___
24 (left x 2 = right) MULTI-STEP
4 : 16, 6 : 36, 9 : ___
81 (left squared = right)
9 : 4, 13 : 8, 20 : ___
15 (left - 5 = right)
6 : 14, 10 : 22, 3 : ___
8 (left x 2 + 2 = right) MULTI-STEP
12 : 5, 20 : 13, 30 : ___
23 (left - 7 = right)
30 : 15, 18 : 9, 42 : ___
21 (left divided by 2 = right)
4 : 18, 3 : 14, 7 : ___
30 (left x 4 + 2 = right) MULTI-STEP