Problem: in a lottery there are 100 prizes and 300 blanks . a lottery is drawn at random . what is the probability of getting a prize ?
Rationale: "total draws = prizes + blanks = 100 + 300 = 400 probability of getting a prize = 100 / 400 = 1 / 4 correct option is e"
annotated_formula: divide(300, add(100, 300))