During a baseball game, a pitcher threw a total of 40 pitches, some of

During a baseball game, a pitcher threw a total of 40 pitches, some of which were fastballs, and the rest of which were curveballs. How many curveballs did the pitcher throw?

(1) Between 81% and 84% of all the pitches the pitcher threw were fastballs.

(2) The number of fastballs the pitcher threw was between 350% and 450% greater than the number of curveballs the pitcher threw.