Post a New Question

math

posted by .

mike has an average of 89 on the five tests he has taken so far this semester. what grade must mike earn on the next test to raise his average grade exactly to 90?

  • math -

    5 * 89 = 445

    600 * 0.9 = 540

    540 - 445 = 95

  • math -

    ( x 1 + x 2 + x 3 + x 4 + x 5 ) / 5 = 89 Multiply both sides by 5

    x 1 + x 2 + x 3 + x 4 + x 5 = 89 * 5 = 445


    ( x 1 + x 2 + x 3 + x 4 + x 5 + x 6 ) / 6 = 90

    ( 445 + x 6 ) / 6 = 90 Multiply both sides by 6

    445 + x 6 = 6 * 90 = 540

    x 6 = 540 - 445 = 95

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

More Related Questions

Post a New Question