Preference

Question: If the sum of (8, 5 and x) is 21, then the average of (8, 5 and x) is--

  1. a.
    7
  2. b.
    9
  3. c.
    2
  4. d.
    3.5
  5. e.
    None of these
Answer: a

Question: Average of P numbers is x and average of N numbers is y. Find the average of all of the numbers.

  1. a.
    (Px + Ny)/(p + N)
  2. b.
    (Px + Ny)/xy(P + N)
  3. c.
    x + y
  4. d.
    (x + y)/(P + N)
  5. e.
    (x + y)/2
Answer: a

Question: Average of P numbers is x and average of N numbers is y. Find the average of all of the numbers.

  1. a.
    (Px + Ny)/(p + N)
  2. b.
    (Px + Ny)/xy(P + N)
  3. c.
    x + y
  4. d.
    (x + y)/(P + N)
  5. e.
    (x + y)/2
Answer: a

Question: The average of three numbers is 7. If 2 of the numbers are zero, then what if the 3rd number?

  1. a.
    15
  2. b.
    17
  3. c.
    19
  4. d.
    21
  5. e.
    None of these
Answer: d

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