Correction :

32 - 24 = 8	3 + 5 = 8
4 + 21 = 25	27 - 23 = 4
6 + 20 = 26	38 - 23 = 15
10 + 3 = 13	31 - 20 = 11
23 + 14 = 37	42 - 22 = 20
7 + 5 = 12	10 + 2 = 12
32 - 23 = 9	16 + 9 = 25
15 + 3 = 18	24 + 4 = 28
20 - 17 = 3	24 - 17 = 7
6 + 7 = 13	21 - 16 = 5