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Thread: SAT math average

  1. #1

    SAT math average

    SAT math average statistics

    Could you help with the following question:
    "The average of x and y is 10 and the average of x,y and z is 15. Find the value of z."

    Thanks in advance!!

  2. #2

    SAT math average

    SAT math average question

    "The average of x and y is 10 and the average of x,y and z is 15. Find the value of z."
    The arithmetic mean, also known as average, is the sum of all the values in a list of numerical values divided by the number of items in the list.

    "The average of x and y is 10" : (1)

    "the average of x,y and z is 15" : (2)

    Subtracting (1) and (2) you have that

  3. #3
    Thanks Jack!!

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