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      Question

      If the third proportion of 25 and 20 is тАЬ0.5kтАЭ, then

      find the value of (k тИТ 8) : (k + 24).
      A 3:7 Correct Answer Incorrect Answer
      B 4:5 Correct Answer Incorrect Answer
      C 5:6 Correct Answer Incorrect Answer
      D 7:9 Correct Answer Incorrect Answer

      Solution

      Third proportion of two numbers тАШaтАЩ and тАШbтАЩ is (b┬▓/a).
      So, 0.5k = (20┬▓/25) = 16
      Or, 'k' = 32
      Required value = (32 - 8) : (32 + 24) = 24 : 56 = 3 : 7

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