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    Question

    Ratio of two numbers 3:7 and their LCM is 840. Find the

    sum of the given two numbers.
    A 280 Correct Answer Incorrect Answer
    B 360 Correct Answer Incorrect Answer
    C 400 Correct Answer Incorrect Answer
    D 350 Correct Answer Incorrect Answer

    Solution

    Let the two numbers be '3h' and '7h', where 'h' is the HCF of the two given numbers. Product of two numbers = (Product of LCM and HCF) of the given two numbers 3h ├Ч 7h = h ├Ч 840 Or, 21h = 840 So, 'h' = (840 / 21) = 40 Therefore, the required sum = 3h + 7h = 10h = 10 ├Ч 40 = 400 Hence, option c

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