500
Riddle Elementary teachers used a bar graph to show the number of students in each grade level. In kindergarten, the graph showed that there were 30 more kids than there were in first grade. There were also 15 fewer students in first grade than in second grade. If there were 120 second graders, how many students were there in kindergarten and first graders?
Kindergarten: 135 students; 1st grade: 105 students