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Question 1
The average (arithmetic mean) of x and y is 30. If z = 10, what is the average of x, y, and z?
  1. 13 1/3
  2. 21 1/4
  3. 23 1/3
  4. 21 1/3
  5. 22 1/4
The correct Answer is 23 1/3 and the correct Choice is (C).

Explanatory Answer
The average of x and y = 30.

i.e., (x+y)/2 = 30

Hence, x + y = 60

If z = 10, then x + y + z = 60 + 10 = 70.

Therefore, the average of x, y and z = (x+y+z)/3 = 70/3
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