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      Question

      If the third proportion of 14 and 28 is “0.5k”, then

      find the value of (k − 10) : (k + 8).
      A 17:20 Correct Answer Incorrect Answer
      B 9:12 Correct Answer Incorrect Answer
      C 5:7 Correct Answer Incorrect Answer
      D 6:10 Correct Answer Incorrect Answer

      Solution

      Third proportion of two numbers ‘a’ and ‘b’ is (b²/a).
      So, 0.5k = (28²/14) = 56

      Or, 'k' = 112
      Required value = (112 - 10) : (112 + 8) = 102 : 120 = 17 : 20

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