Question

Susan's average grade on all her math exams is exactly 78. She figures that if she gets a 92 on the next exam her new average will round to 80. Find the possible numbers of exams Susan might have taken, including her last exam.

Answer 1

Answer:

7

Step-by-step explanation:

Let x be the number of exams Susan took not inculing the last.

78x+92=80(x-1)

2x=12

x=6

Thus, the answer is 6+1=7