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This is my math question:
mildred has seven grades on her report card. the overall average of these seven
grades is 77%.
after looking more closely at her report card, mildred discovered that her
english grade was incorrectly recorded as 18% instead of her actual grade of 81%.
determine mildred’s correct report card average.
i want to know the steps to complete this i do not want the answer just the steps to complete this

Answers

  • Réponse publiée par: girly61
    The correct report card average for 7 subjects is 85%.

    Step-by-step explanation:

    If average is 77% and the incorrectly recorded English subject is 18:

    Total subjects: 7

    Average: 77%

    English subject: 18%

    Average grade in other 6 subjects: x

    Total grades in other 6 subjects: 6x

    Find x, the average grade in other 6 subjects:

    (6x + 18)/7 = 77

    6x + 18 = 77(7)

    6x = 539 - 18

    6x/6 = 521/6

    x = 86.83  average grade of 6 other subjects

    Find the new average y of the 7 subjects grades if English is corrected at 81%.

    (6x + 81)/7 = y

    Substitute x = 86.33

    y = [6(86.83) + 81]/7

    y = [520.98 + 81]/7

    y = [601.98]/7

    y = 85.99 or 85%  correct average

    The correct report card average for 7 subjects is 85%.

    #ANSWERFORTREES

  • Réponse publiée par: 09389706948
    There are 632.50 peso coins
  • Réponse publiée par: RoseTheShadowHunter
    My guess is:

    50%
    70%
    90%
    95%
    55% 
    are any of the following guesses right?  
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This is my math question: mildred has seven grades on her report card. the overall average of these...