Correction :

15 + 16 = 31	32 - 13 = 19
11 + 23 = 34	3 + 19 = 22
3 - 0 = 3	22 - 22 = 0
16 + 5 = 21	10 + 20 = 30
18 + 17 = 35	22 - 7 = 15
14 - 12 = 2	20 - 2 = 18
18 - 18 = 0	17 + 9 = 26
16 + 1 = 17	23 - 19 = 4
6 + 24 = 30	15 + 22 = 37
22 - 9 = 13	24 + 17 = 41