word problem, Im lost on how to set this up

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Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to

a) Get a C average on exams?
f


b) Get a B average on exams?
f



c) Get an A average on exams?
f

< > or = to

  • word problem, Im lost on how to set this up -

    84 + 89 + 90 = 263 points

    400 = total possible points

    0.7 * 400 = 280 needed for a C
    0.8 * 400 = _____ needed for a B
    0.9 * 400 = _____ needed for an A

  • word problem, Im lost on how to set this up -

    sorry but I did not, I worked out what you posted and entered them in online and my answers were rejected.

    ps. i didn't realize I could respond to you on this

  • word problem, Im lost on how to set this up -

    You didn't complete the problem.

    For a C, 280 points are needed. Since Joe already has 263 points, he only needs 17 points on the last test for a C.

    For a B, 320 points are needed.
    320 - 263 = 57 needed

    For an A -- 360 points are needed.
    360 - 263 = ?

  • word problem, Im lost on how to set this up -

    ahh now I see it! 17, 57, 97. not sure what I was thinking there. Thanks for your help!

  • word problem, Im lost on how to set this up -

    You're very welcome.

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