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    Question

    Find the greatest 4‑digit number which is exactly

    divisible by 12, 15 and 20.
    A 2,900 Correct Answer Incorrect Answer
    B 9,960 Correct Answer Incorrect Answer
    C 8,060 Correct Answer Incorrect Answer
    D 7,960 Correct Answer Incorrect Answer

    Solution

    LCM(12, 15, 20): 12 = 2² × 3 15 = 3 × 5 20 = 2² × 5 LCM = 2² × 3 × 5 = 4 × 3 × 5 = 60 Greatest 4‑digit number = 9,999 Divide by 60: 9,999 ÷ 60 = 166 remainder 39 Largest multiple = 60 × 166 = 9,960 Answer: 9,960.

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