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15 questions
14 - 11 =
16 - 7 =
10
9
8
7
18 - 12 =
9 - 8 =
17
10
2
1
8 - 4 =
12 - 7 =
5
6
7
19
17 - 9 =
18 - 5 =
11
12
13
14
19 - 10 =
20 - 7 =
3
13
12
2
12 - 8 =
20 - 9 =
11
1
12
10
14 - 9 =
16 - 11 =
10
15
5
6
20 - 10 =
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