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## Ann’s grade is the average of four scores: three chapter tests and a final that counts as two chapter tests. She scored 72, 90, and 75

Question

Ann’s grade is the average of four scores: three chapter tests and a final

that counts as two chapter tests. She scored 72, 90, and 75 on the chapter

tests. What score does she need on the final to have a grade of at least 80?

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Mathematics
3 years
2021-07-17T13:52:32+00:00
2021-07-17T13:52:32+00:00 1 Answers
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## Answers ( )

Answer:f = 81.5

Step-by-step explanation:hello!

to be able to find the score she needs to have a final grade of at least 80, we use the following equation:

To get rid of the denominator, we multiply both sides of the equation by 5. Once we do, 5 gets canceled and 80 * 5 = 400. Therefore:

237 + 2f = 400.

Transpose, then simplify.

2f = 400 – 237

2f = 163

Divide both sides by 2 to isolate f:

f = 81.5