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    Question

    Two positive integers have HCF 12 and LCM 180. If the

    sum of the two numbers is 96, what is the positive difference between them?
    A 32 Correct Answer Incorrect Answer
    B 24 Correct Answer Incorrect Answer
    C 38 Correct Answer Incorrect Answer
    D 42 Correct Answer Incorrect Answer

    Solution

    ATQ, Let the numbers be a and b. a ├Ч b = HCF ├Ч LCM = 12 ├Ч 180 = 2160. a + b = 96. So a and b are roots of t┬▓ тИТ 96t + 2160 = 0. Discriminant: ╬Ф = 96┬▓ тИТ 4├Ч2160 = 9216 тИТ 8640 = 576 тЗТ тИЪ╬Ф = 24. Roots: (96 ┬▒ 24)/2 тЗТ 60 and 36. Difference = 60 тИТ 36 = 24.

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