Averaging Test Grades

The video tutorial explains how to calculate the score needed on a fifth test to achieve an average of 80% across five tests. It begins with an introduction to the problem, followed by a detailed explanation of how averages are calculated. The instructor sets up an equation to find the unknown score and solves it step-by-step. The tutorial concludes with a verification of the solution, ensuring the calculated score is correct.

What mathematical operation is used to isolate the variable X in the equation?

What does Billy need to score on the fifth test to ensure he meets or exceeds the required average?