Mr. Patrick teaches math to 15 students. He was grading tests and found that when he graded everyone's test except Payton's, the average grade for the class was 80. After he graded Payton's test, the test average became 81. What was Payton's score on the test?

1

Jawapan

2016-03-14T10:28:50+08:00
If the average of the first  peoples' scores was , then the sum of all of their tests is . When Payton's score was added, the sum of all of the scores became . So, Payton's score must be 1215 - 1120 = 95