Question

6) A student scored an 88, S2, and 76 on three math tests. What does the student need to get on the fourth test to have an average of 85 for all four tests? James wants to use algebra to solve this problem. Which equation should he use? 256 4x 85 256 x 85 85 x 256 256 85x

Answer 1

Equation B.
The average of the sum of the existing 3 scores plus the score of the new test should equal 85.

To solve this, multiply both sides by 4 and subtract 256. The student needs an 84 in order to have an average of 85.