posted by .

the average (arithmetic mean) of a and b is 6 and the average of a, b, c is 11. What is the value of c?

  • math -

    (a+b)/2 = 6
    a+b = 12

    (a+b+c)/3 = 11
    a+b+c = 33
    12+c = 33
    c = 21

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    14.what value of n will result in a mean if 31 15.what value of n will result in a median of 23 15.what value of a will result in a range of 84 14,46,19,10,39,22,24,77,n Refresh your memory about the defnition of median, mode and range …
  2. calculus

    is average rate of change and average value the same or will you get a different answer for each this is calculus so it's the mean average. it's using the formula and integrating. I don't understand your question, but I can assure …
  3. algebra 2

    The average (arithmetic mean) of the test scores of class of a class of x students is 74, and the average of the test scores of a class of y students is 88. When the scores of both classes are combined, the average is 76. What is value …
  4. math

    if the average (arithmetic mean) of a and -5 is 10, then a =
  5. math

    The average (arithmetic mean) of x and y is m, where m does not equal to 0. What is the average (arithmetic mean) of x, y, and z?
  6. melanie

    What is the average (arithmetic mean) value of the integers from -50 to 50, inclusive?
  7. Math

    The average (arithmetic mean) and median of the five numbers a,a,b,c, and c are 20 and 30, respectively. If a < b < c, what is the value of a + c?
  8. Math

    1)If a (theres a square)b is defined as the average of a and b, what is the value of 2 (theres a square) 4 (theres a square) 9?
  9. averages

    if a<b<c<d<e<110 and the average (arithmetic mean) of a,b,c,d,e is 100 what is the lease possible value of a
  10. maths

    1.hw many 3 digit nos are divisible by 7?

More Similar Questions