Question

Kate has scored 10 free throws out of 18 tries. She would really like to bring her free throw average up to at least 80%. How many consecutive free throws should she score in order to bring up her average to 80%?

Answer 1

(10+t)/(18+t)=8/10
8(18+t)=10(10+t)
144+8t=100+10t
44=2t
t = 22 throws