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15 questions
30 - 20 =
10
5
40
4
60 - 10 =
50
40
30
70
50 - 40 =
10
1
20
90
70 - 30 =
40
4
30
20
90 - 30 =
60
70
50
30
90 - 70 =
20
2
30
40
40 - 20 =
20
10
30
5
80 - 70 =
10
20
30
5
60 - 40 =
20
10
30
2
90 - 50 =
40
30
20
4
100 - 30 =
70
80
7
60
20 - 10 =
10
20
0
15
100 - 80 =
20
30
10
40
50 - 30 =
20
2
10
30
50 - 40 =
10
1
20
30
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