SOLUTION: In your Economics 101 class, you have scores of 68, 82, 87, and 89 on your first four of five tests. To get a grade of B, the average of the first five test scores must be greater

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Question 1208893: In your Economics 101 class, you have scores of 68, 82, 87, and 89 on your first four of five tests. To get a grade of B, the average of the first five test scores must be greater than or equal to 80 and less than 90.
A. Solve an inequality to find the range of the scores that you need on the last test to get a B.
B. What score do you need if the fifth test counts as double?
Answer by timofer(104) About Me  (Show Source):
You can put this solution on YOUR website!
Want a B, and need average between 80 and 90
FIVE tests, only took 4 at the time

80%3C=%2868%2B82%2B87%2B89%2Bx%29%2F5%3C90

But if instead to be last test to count as TWO regular tests, then this way:
80%3C=%2868%2B82%2B87%2B89%2B2x%29%2F6%3C90

You can perform the algebraic steps.