Correction :

17 - 6 = 11	18 + 7 = 25
18 + 10 = 28	10 : 2 = 5
10 + 21 = 31	0 + 24 = 24
17 - 16 = 1	2 - 2 = 0
22 - 1 = 21	9 + 19 = 28
17 + 14 = 31	3 + 10 = 13
18 - 17 = 1	2 + 10 = 12
77 : 7 = 11	20 - 1 = 19
5 + 16 = 21	19 + 19 = 38
33 - 24 = 9	14 - 9 = 5