A basketball player’s free-throw percentage is the ratio of the number of successful shots made to the number of shots attempted. A basketball player has made 13 of the first 20 free throws she has attempted this season. Which rational expression can be used to find the free throw percentage for the season if she successfully makes her next x free-throw attempts?
A) 13x over 20x
B) 13 + X over 20 + x
C) 13 + x over 20
D) 13 over 20 + X