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      Question

      Out of four numbers the average of the first three is 16

      and that of the last three is 15. If the last number is 20 then the first number is
      A 23 Correct Answer Incorrect Answer
      B 25 Correct Answer Incorrect Answer
      C 28 Correct Answer Incorrect Answer
      D 21 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let three numbers be a, b and c respectively a + b + c = 16 x 3 = 48 ….(i) b + c + 20 = 15 x 3 = 45 b + c = 45 – 20 = 25 …..(ii) By Subracting, equation (i) – (ii) a = 48 – 25 = 23

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