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21 December, 06:15

The average (mean) of 90 numbers is 60, and the average of 60 numbers is 90. What is the average of all the numbers? I will mark brainliest for the best explanation

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Answers (2)
  1. 21 December, 08:51
    0
    Answer: 72

    Step-by-step explanation:

    Total Score of 90 nos

    90 x 60 = 5400

    Total score of 60 nos

    60 x 90 = 5400

    Average of (90 + 60) = 10800 / 150 = 72
  2. 21 December, 09:06
    0
    72

    Step-by-step explanation:

    You need to find the average of all the number. However, you are given two averages that have unequal numbers. To solve, you need to multiply each average by the amount of number it has in it.

    90 * 60 = 5400

    60 * 90 = 5400

    You need to find the total amount of number as well as the total value of the numbers.

    90 + 60 = 150

    5400 + 5400 = 10800

    Divide the total value by the total amount of number to find the average.

    10800/150 = 72

    The total average is 72.
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