Posted by **Jennifer** on Wednesday, November 30, 2011 at 6:49pm.

Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade:

75+85+90+X

___________ >

4

x is her last score which has not been taken. Explain this equation and the process you would use to solve for the unknown test score. Solve for the test score.

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