ALgebra

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tom scores 83,88,75, and 90 on the first 4 tests in algebra. what does he need to get on the 5th test to have an average of 85?

  • ALgebra -

    Assuming that the total possible score on each test, then the total possible points for 5 tests is 100.

    0.85 * 500 = 425

    He has a total of 336 points now.

    425 - 336 = 89

  • ALgebra -

    You can also do this problem this way:
    (83+88+75+90+x)/5=85

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