Question

Mr. Patrick teaches math to 1515 students. He was grading tests and found that when he graded everyone's test except Payton's, the average grade for the class was 8080. After he graded Payton's test, the test average became 8181. What was Payton's score on the test?

Answer 1

Given:
15 students
average grade: 80 for 14 students
average grade: 81 for 15 students

80 * 14 = 1120
81 * 15 = 1215

1215 - 1120 = 95

Payton's score on the test is 95.