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    Question

    Find the greatest 4-digit number which is exactly

    divisible by 12, 15 and 18.
    A 8900 Correct Answer Incorrect Answer
    B 9970 Correct Answer Incorrect Answer
    C 9600 Correct Answer Incorrect Answer
    D 7900 Correct Answer Incorrect Answer

    Solution

    12 = 2┬▓ ├Ч 3 15 = 3 ├Ч 5 18 = 2 ├Ч 3┬▓ LCM = 2┬▓ ├Ч 3┬▓ ├Ч 5 = 4 ├Ч 9 ├Ч 5 = 180 Greatest 4-digit number = 9999 Greatest multiple of 180 тЙд 9999: 9999 ├╖ 180 тЙИ 55.55тАж, so take 55 Required number = 55 ├Ч 180 = 9900

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