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    Question

    If the third proportion of 45 and 60 is “0.5k”, then

    find the value of (k − 20) : (k + 40).
    A 8:12 Correct Answer Incorrect Answer
    B 7:10 Correct Answer Incorrect Answer
    C 6:9 Correct Answer Incorrect Answer
    D 5:8 Correct Answer Incorrect Answer

    Solution

    Third proportion of two numbers ‘a’ and ‘b’ is (b²/a).
    So, 0.5k = (60²/45) = 80
    Or, 'k' = 160
    Required value = (160 - 20) : (160 + 40) = 140 : 200 = 7 : 10

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