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      Question

      How many numbers from 1 to 500 (both included) are

      divisible by 6 or 10?
      A 132 Correct Answer Incorrect Answer
      B 117 Correct Answer Incorrect Answer
      C 165 Correct Answer Incorrect Answer
      D 127 Correct Answer Incorrect Answer

      Solution

      Multiples of 6 up to 500 = ⌊500/6βŒ‹ = 83 Multiples of 10 up to 500 = ⌊500/10βŒ‹ = 50 Numbers counted twice (divisible by 6 and 10) are multiples of LCM(6,10) = 30 Multiples of 30 up to 500 = ⌊500/30βŒ‹ = 16 Required numbers = 83 + 50 βˆ’ 16 = 117

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