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20 September, 21:45

The average of four numbers is 98. If three of the numbers are 86,87, and 91 what is the fourth number?

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  1. 21 September, 01:25
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    To find the average, you have to add all the numbers up and then divide by the amount of numbers you added together.

    Equation: (86+87+91+x) / 4=98

    Solve for x:

    86+87+91+x=98*4

    264+x=392

    x=392-264

    x=128

    The fourth number is 128
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