Question

Joey wants to earn an A on his report card. So far he has taken 3 exams and has one

more to go. On the first three exams, Joey scored 88%, 92%, and 84%. What does Joey
need to score on the last test to have an average of 90% for the 9 weeks?

Answer 1

96%

Explanation:

To have an average of 90 for 4 exams, you know that the sum of the scores on all 4 exams would be 90 * 4 = 360. The sum of the first three scores is 88 + 92 + 84 = 264.

The last thing you have to do is 360 - 264 = 96 because then you know the score he has to get is 96 for an average of 90 on all four exams.