The answer of .03% of 1500 is .45
It would be 220 because 20 students in all, 20×20 is the 400 students. so if you just multiplied the 9 and 11 by 20, it would match up with 400 students and you would have 220 girls. (This is not how most people work this out, but I hope it helped).
5*z=35
Therefore z=35/5
=
Z7