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    Question

    Two numbers are in the ratio of 4:5, respectively. If their

    HCF is 18, then find their LCM.
    A 180 Correct Answer Incorrect Answer
    B 360 Correct Answer Incorrect Answer
    C 720 Correct Answer Incorrect Answer
    D 540 Correct Answer Incorrect Answer

    Solution

    Since their HCF is 18.

    So, numbers are (4 x 18 = 72) and (5 x 18 = 90).

    We know that product of numbers = HCF x LCM

    72 x 90 = 18 x LCM

    Or, 6,480 = 18 x LCM

    So, LCM = (6,480/18) = 360

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