ACT PREP - Averaging Grades to Pass Class

The video tutorial explains how to calculate the lowest grade a student needs on a fourth test to achieve an average of at least 80 across four tests in algebra. It begins by introducing the problem, then explains how to calculate an average. The tutorial sets up an equation to solve the problem, walks through the steps to solve it, and concludes by verifying the solution.

What mathematical operation is used to eliminate the division by 4 in the average calculation?

After calculating, what score did the student need on the fourth test to achieve the required average?