Question

    Find the fourth proportion of (k + 2), (2k), and (3k +

    6). (Note: 'k' is the smallest two-digit prime number.)
    A 64 Correct Answer Incorrect Answer
    B 65 Correct Answer Incorrect Answer
    C 66 Correct Answer Incorrect Answer
    D 68 Correct Answer Incorrect Answer

    Solution

    k = 11
    k + 2 = 13
    2k = 22
    3k + 6 = 33 + 6 = 39
    13 : 22 :: 39 : m
    13m = 22 × 39 = 858
    m = 858 ÷ 13 = 66

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