Each student worked on 115 math problems.
Step-by-step explanation:
Given,
Problems solved in 4 hours = 8970
Number of students in competition = 78
As each student solved same number of problems, we will divide the total problems solved by number of students to find the amount of problems solved by one student.
Problems solved by one student = 
Problems solved by one student = 115
Each student worked on 115 math problems.
Keywords: division
Learn more about division at:
#LearnwithBrainly