SOLUTION: i have no idea how to do this problem: on her last two math tests has scores of 83 and 92 asumming she can not score any higher then 100. determine all possible scores lisa can sco

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Question 372727: i have no idea how to do this problem: on her last two math tests has scores of 83 and 92 asumming she can not score any higher then 100. determine all possible scores lisa can score to have an average of 90 on all three tests. represent your answers algabraically and graphically
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
To find the average, sum the scores and divide by 3.
Assume she gets X on the last test.
A%3E=90
%2883%2B92%2BX%29%2F3%3E=90
176%2BX%3E=270
highlight%28X%3E=94%29
You also know that X%3C=100
94%3C=X%3C=100