Question

Jason earned scores of 90 points, 82 points, 95 points, and 86 points on four tests. What is the lowest score he can get on the fifth test and still finish with an average score of 90 points?

Answer 1

He would need to get a 97 on the next test

Answer 2

So you know that average is equal to all the scores added together divided by the amount of tests right? Now you have 5 tests and you need an average of 90 points.
Average=scores added together/no. of test
90=x/5
90*5=x
450=x
Now take 450 subtract all your other 4 scores to get your lowest 5th score
450-90-82-95-86=97
You need at least 97 to have an average of 90.