Chelsea had made six of seventeen free-throw attempts. How many consecutive free throws must she make to raise her percentage of free throws made to exactly 50 percent?

Answer 1

(6+x)/(17+x) = 1/2
12 + 2x = 17+x
x = 5

check:
with 5 more successful throws she made 11 good ones
out of a total of 17+5 or 22
11/22 is 50%