14. of the 400 students in the 8th grade, four-
fifths have purchased tickets for the end of
year trip. if there needs to be two
chaperones for every 75 students, how many
chaperones are needed?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?