SOLUTION: Please help me help my son with this grade computation problem...In order to earn an A in Mrs. Padilla's intermediate algebra course, Mark must obtain an average score of at least

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Question 483005: Please help me help my son with this grade computation problem...In order to earn an A in Mrs. Padilla's intermediate algebra course, Mark must obtain an average score of at least 90. On his first four exams Mark scored 94, 83, 88, and 92. The final exam counts as two test scores. What score does Mark need on the final to earn an A?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Let x is the final exam score
If the final exam counts as two test scores, so we can say, that Mark had 4%2B2=6tests. Then average score is %2894%2B83%2B88%2B92%2B2x%29%2F+6, to earn an A, Mark must obtain an average score of at least 90, so
%2894%2B83%2B88%2B92%2B2x%29%2F+6%3E=90multiply by 6
357%2B2x%3E=540
2x%3E=540-357
2x%3E=183
x%3E=183%2F2
x%3E=91.5
x%3E=92
Mark needs on the final exam at least 92 to earn an A