Give the step-by-step reasoning process and then the final answer. Of the 600 students at River Falls High School, 3/4 of them play tennis. Of those that play tennis, 60% of them also play hockey. How many students play both hockey and tennis?
3 / 4 of the students at River Falls High School play tennis, a total of 3 / 4 * 600 = 450 students. Of those that play tennis, 60% of them also play hockey, meaning 60 / 100 * 450 = 270 students play hockey and tennis.
The final answer: 270.