Slim Johnson was usually the best free-throw shooter on his basketball tam. Early in the season, however, he had made only 9 of 20 shots. By the end of the season, he had made all the additional shots he had taken, thereby ending with a season reacord of3 : 4. How many additional shots had he taken?

Answer 1

(9 + x)/(20 + x) = 0.75

Solve that for x, the number of additional free throws taken.

9 + x = 15 + 0.75 x

0.25 x = 6

Take it from there.

Answer 2

24 additional shots