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      Question

      Find the smallest perfect square that is divisible by 10,

      14, 18, and 21. What is the remainder when it is divided by 85?
      A 12 Correct Answer Incorrect Answer
      B 14 Correct Answer Incorrect Answer
      C 30 Correct Answer Incorrect Answer
      D 27 Correct Answer Incorrect Answer

      Solution

      ATQ,

      LCM of 10, 14, 18 and 21 = 630

      Since, 630 = (2 Γ— 3 Γ— 3 Γ— 5 Γ— 7)

      To make it a perfect square, multiply by (2 Γ— 5 Γ— 7) = 70

      So, required number = 630 Γ— 70 = 44100

      44100 Γ· 85 = 518 Γ— 85 + 30

      So, desired remainder = 30

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