Juan’s first 3 exam scores are 85, 93, and 87. What does he need to score on his next exam to average 90 for all 4 exams?
let x represent the score on his next exam
(put this in a multi-step equation)
an average of 90 on 4 exams means 4*90=360 points in all.
So, how many points shy of 360 is the sum of the first three tests?posted by Steve
95posted by Josie