Problema Solution
You have to average at least a 90 on your test scores to get an A. You already have an 85, 92, and 91. What scores must you receive on your next test to earn a 90 average?
Answer provided by our tutors
let
x = the score needed on the next test
then the average of the 4 scores has to be 90 that is
(85 + 92 + 91 + x)/4 = 90 multiply both sides by 4
x = 92
you must score 92 to have an average of 90.