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      Question

      The HCF of two numbers is 56, and their LCM is 1680.

      What is the sum of the numbers?
      A 616 Correct Answer Incorrect Answer
      B 625 Correct Answer Incorrect Answer
      C 640 Correct Answer Incorrect Answer
      D 680 Correct Answer Incorrect Answer

      Solution

      Let the two numbers be 56x and 56y.
      Then,
      Product of the numbers = Product of HCF and LCM
      56x Γ— 56y = 56 Γ— 1680
      xy = 30
      Let x = 5 and y = 6 (As co-prime factors of 30 are 5 and 6).
      Then, the sum of the numbers is
      56 Γ— 5 + 56 Γ— 6 = 56 Γ— 11 = 616

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