Answer:
18 fastballs
Step-by-step explanation:
Let x represent each throw
fastball : curve ball = 3:2
For fastball we have 3x while for curve ball we have 2x
If Rick makes a relief appearance of 30 pitches with the same ratio,
3x + 2x = 30
5x = 30
x = 30/5
x = 6
fastball, 3x= 3*6
= 18
curveball = 2x = 2*6
= 12
Rick will throw 18 fast balls