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Math Help - grade calculation word problem

  1. #1
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    help with word problem

    a student has an 87 as a current math grade. this total comes from quizzes.
    this total is 75% of the students final grade. the final exam is 25% of his grade. what score must the student get on his final exam to achieve at least a C 70-79% for the final grade?
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  2. #2
    Site Founder Math Help's Avatar
    Joined
    Apr 2005
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    Grade analysis

    Quote Originally Posted by Nicv
    a student has an 87 as a current math grade. this total comes from quizzes.
    this total is 75% of the students final grade. the final exam is 25% of his grade. what score must the student get on his final exam to achieve at least a C 70-79% for the final grade?
    Final grade = (current grade * % current grade is of final grade) + (final exam grade * % final exam is of final grade)

    The lowest final grade a person can have and still have a C is 70%, so

    .7 = (87 * .75) + (x * .25)

    .7 = .6525 + .25x

    .0475 = .25x

    x = .19

    student must get at least a 19% on the final in order to get a C.
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