Question 1183850
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The sum is  S = a + b + c + . . . + q    (let say, n addends)


The average is  A = {{{(a + b + c + ellipsis + q)/n}}}.



If to divide  the sum S by the average A, you will get the number of addends "n".


    (as an accurate person, I will assume that the sum is not zero, so the division is possible)



<U>ANSWER</U>.  Option D in your list.
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Solved and explained.