To get a final grade of B, a student must have an average mark on five tests that is greater than or equal to 80 and less than 90. If Lisa's grades on the first four tests were 97, 93, 78 and 87, solve

To get a final grade of B, a student must have an average mark on five tests that is greater than or equal to 80 and less than 90.

If Lisa's grades on the first four tests were 97, 93, 78 and 87, solve for the range of grades x that she could score on the fifth test that would result in her getting a final grade of B.

Give your answer as an inequality.

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