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      Question

      The sum of two numbers is 80 whereas the sum of their

      reciprocals is (22/11). Find the square of the product of the two numbers.
      A 2100 Correct Answer Incorrect Answer
      B 1440 Correct Answer Incorrect Answer
      C 1600 Correct Answer Incorrect Answer
      D 1200 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the two numbers be 'm' and 'n'.

      So, m + n = 80

      And (1/m) + (1/n) = (22/11)

      Or, {(m + n)/(mn)} = (22/11)

      Or, mn = (11/22) Γ— 80 = 40

      So, required square = 40Β² = 1600

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