how many students do not snowboard?

how many students do not snowboard?
Answer
Explanation:
Step1: Sum the numbers not in the snowboard circle
Add (7 + 2+13 + 6) $$7 + 2+13 + 6=(7 + 13)+(2 + 6)=20 + 8 = 28$$
Answer:
28

how many students do not snowboard?
Add (7 + 2+13 + 6) $$7 + 2+13 + 6=(7 + 13)+(2 + 6)=20 + 8 = 28$$
28