15___
58 - 15 + 20 = 63
60 + 15 - 28 = 47
(30 + 12) - 15 = 37
10___
58 - 10 + 20 = 68
60 + 10 - 28 = 42
(30 + 12) - 10 = 32
25___
58 - 25 + 20 = 53
60 + 25 - 28 = 57
(30 + 12) - 25 = 17
8___
58 - 8 + 20 = 70
60 + 8 - 28 = 40
(30 + 12) - 8 = 34
0___
58 - 0 + 20 = 78
60 + 0 - 28 = 32
(30 + 12) - 0 = 42