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25 June, 10:34

The average of 3, 15, and my number is 40. What is my number?

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Answers (2)
  1. 25 June, 10:43
    0
    Answer: the average of 3 and 15 is 9
  2. 25 June, 12:06
    0
    102

    Step-by-step explanation:

    Let your number be n

    The average of 3,15 and your number is found by adding the three numbers and dividing by 3

    (3+15+n) / 3

    That is equal to 40

    (3+15+n) / 3=40

    Multiply each side by 3 to get rid of the fraction

    (3+15+n) / 3 * 3 = 40*3

    (3+15+n) = 120

    Combine like terms

    18+n = 120

    Subtract 18 from each side

    18-18 + n = 120-18

    n = 102

    Your number is 102
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