Answer:
9) 60 artists
10) 27 black shoes
11) Alexandra is wrong, 30% of 60 and 60% of 30 are equivalent, they both equal 18.
12) 96 dogs
13) 125 students
14) 600 students
15) 50 tulips
16) 70 cars
17) The percent that Rory uses has to be greater than 100.
