The answer is A.30%
The way I did this problem was from a number line. I don't have a one: so I'll just make one.
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
So, what you do here is you take out 30% because those are NOT tornadoes fans. 10% 20% 30% 40% 50% 60% 70% .
It says that 40% are girls so... 10% 20% 30%.
Hope you get it right!