SOLUTION: Tammy has scored 79 ,89 ,91 , and 60 on her previous four tests. What score does she need on her next test so that her average (mean) is 77?

Algebra ->  Average -> SOLUTION: Tammy has scored 79 ,89 ,91 , and 60 on her previous four tests. What score does she need on her next test so that her average (mean) is 77?      Log On


   

Question 680394: Tammy has scored 79 ,89 ,91 , and 60 on her previous four tests. What score does she need on her next test so that her average (mean) is 77?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
%28%2879%2B89%2B91%2B60%29%2Bx%29%2F5+=+77
...
%28319%2Bx%29%2F5+=+77
...
319+x = 5(77)
319 + x = 385
x = 385 - 319
highlight_green%28x+=+66%29 on the next test
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