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    Question

    The sum of two numbers is 143, and their difference is

    13. What is the L.C.M of these two numbers?
    A 374 Correct Answer Incorrect Answer
    B 446 Correct Answer Incorrect Answer
    C 420 Correct Answer Incorrect Answer
    D 390 Correct Answer Incorrect Answer

    Solution

    Let the two numbers be тАШaтАЩ and тАШbтАЩ where a > b.
    So, a = b + 13
    We have a + b = b + 13 + b = 143
    So, b = (143 тАУ 13) ├╖ 2 = 65
    L.C.M of 65 and 78 = 390

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