You got 17 out of 20.
Your time was 19s.
47÷1
24-64
8-6
90÷5
74+13
3+79
84-8
87+10
68+1
90÷6
12÷4
75÷25
11×5
73+24
55-26
15×10
18×4
52-87
18×19
32-31