Answer: 50 chocolate cones.
Reason: Since there are 5 chocolate cones sold for every 3 vanilla cones, every 3 cones that the vanilla flavor sells, 5 chocolate cones will sell. There fore we would divide 30 by 3 to find out how many people bought the cones and multiply that number by 5. 30/3=10 so we multpily 5 by 10 and get 50.