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      Question

      Find the smallest value of 'x' ('x' is a natural number)

      such that '47x821' is completely divisible by 3.
      B 2 Correct Answer Incorrect Answer
      C 5 Correct Answer Incorrect Answer
      D 8 Correct Answer Incorrect Answer

      Solution

      A number is divisible by 3 when sum of its digits is divisible by 3.

      Sum of digits = 4 + 7 + x + 8 + 2 + 1 = (x + 22)

      (x + 22) is divisible by 3 when 'x' = 2, 5 or 8

      Since we need the smallest natural number, 'x' = 2

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