nadia-has-grades-9173-and-80-3-math-tests-what-grade-must-she-earn-next-test

Nadia has grades of 91,73, and 80 on 3 math tests. What grade must she earn on the next test to have an average of exactly 85 for all 4 tests?

Thanks for installing the Bottom of every post plugin by Corey Salzano. Contact me if you need custom WordPress plugins or website design.