SOLUTION: Anita earned a 74, 86, and 83 on her first three biology exams. What is the minimum score she needs to get on the fourth test in order for her average exam score to be 80?

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Question 1001651: Anita earned a 74, 86, and 83 on her first three biology exams. What is the minimum score she needs to get on the fourth test in order for her average exam score to be 80?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(74=86+83+x)/4=80
243+x=80*4
x=320-243
x=77