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    Question

    If the third proportion of 25 and 20 is “0.5k”, then

    find the value of (k − 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 ‘a’ and ‘b’ is (b²/a).
    So, 0.5k = (20²/25) = 16
    Or, 'k' = 32
    Required value = (32 - 8) : (32 + 24) = 24 : 56 = 3 : 7

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