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Terry has taken 4 of the 5 required tests for her math class. Her grades are​ 83, 78,​ 64, and 91. Terry wants to earn at least a​ "B" for the course. If 80 is the minimum B​ grade, what is the minimum score Terry must get on her last test to get a​ B?

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Answer:

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Step-by-step explanation:

marcthemathtutor

Answer:

84

Step-by-step explanation:

Given, grades for first 4 tests are: 83, 78, 64, 91

Goal: To get an average of 80 points over 5 tests.

Let the score for the 5th test be x

Average score = total score for 5 tests ÷ 5 tests

(substituting the given values above),

80 = (83 + 78 + 64 +91 + x) ÷ 5

80 = (316 + x ) ÷ 5

(80)(5) = (316 + x)

400 = 316 + x

x = 400 - 316

x = 84

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