20
+
40
=
8
+
0
=
21
+
23
=
9
+
2
=
23
+
3
=
14
+
17
=
29
+
7
=
41
+
16
=
8
+
41
=
9
+
46
=
7
+
25
=
49
+
12
=
40
+
0
=
14
+
38
=
1
+
1
=
26
+
47
=
85
+
4
=
5
+
12
=
49
+
40
=
17
+
81
=