Writing inequalities

you must have an average score of at least 80 to get a B on your report card. You have scores of 61,70,99, and 70. What is the minimium score you must get on the last test to get a B on your report card? how do you work this problem out?


You have four test scores. You need 5 averaging 80 so you need 5*80 = 400 points.
400 - (61+70+99+70) = score needed on the last test.

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