SOLUTION: Ricardo’s scores on the first four exams in his algebra class were 66, 81, 75, and 78. What is the minimum score on the fifth exam so that his mean score for the five exams is 80

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Question 648585: Ricardo’s scores on the first four exams in his algebra class were 66, 81, 75, and 78. What is the minimum score on the fifth exam so that his mean score for the five exams is 80 or more?
Found 2 solutions by lynnlo, Alan3354:
Answer by lynnlo(4176) About Me  (Show Source):
Answer by Alan3354(69443) About Me  (Show Source):
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Ricardo’s scores on the first four exams in his algebra class were 66, 81, 75, and 78. What is the minimum score on the fifth exam so that his mean score for the five exams is 80 or more?
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(66 + 81 + 75 + 78 + Score)/5 = 80
300 + Score = 400
Score = 100