90 : 10 = 9
40 : 20 = 2
90 : 30 = 3
80 : 10 = 8
100 : 50 = 2
100 : 20 = 5
60 : 20 = 3
100 : 10 = 10
80 : 40 = 2
3 × 30 : 9 = 90 : 9 = 10
4 × 20 : 8 = 80 : 8 = 10
50 × 2 : 5 = 100 : 5 = 20
30 : 10 = 3
8 × 10 : 4 = 80 : 4 = 20
10 × 2 × 5 = 20 × 5 = 100
10 × 6 : 2 = 60 : 2 = 30