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?

in progress 0
Nguyệt Ánh 3 years 2021-07-17T13:52:32+00:00 1 Answers 58 views 0

Answers ( )

  1. ngockhue
    0
    2021-07-17T13:54:20+00:00
    Reply

    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:

    \frac{72+90+75+2f}{5}=80

    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

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )