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      Question

      The highest common factor (HCF) and the least common

      multiple (LCM) of two numbers add up to 680. Additionally, the LCM is 84 times the HCF. If one of the numbers is 56, what is the other number?
      A 12 Correct Answer Incorrect Answer
      B 48 Correct Answer Incorrect Answer
      C 96 Correct Answer Incorrect Answer
      D 24 Correct Answer Incorrect Answer

      Solution

      Let HCF of the number is โ€˜xโ€™
      LCM = 84 ร— x = 84x
      So, 84x + x = 680
      85x = 680
      x = 8
      Let the other number is โ€˜yโ€™
      Product of two numbers = LCM ร— HCF
      So, 56 ร— y = 84 ร— 8 ร— 8
      y = 96

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