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    Question

    If 'x' is the lowest positive integer divisible by 16,

    18 and 20, then find the second smallest positive integer which is divisible by all the three given numbers?
    A 1440 Correct Answer Incorrect Answer
    B 2160 Correct Answer Incorrect Answer
    C 2880 Correct Answer Incorrect Answer
    D 3240 Correct Answer Incorrect Answer

    Solution

    Lowest positive integer divisible by 16, 18 and 20 = LCM (16, 18, 20) So, LCM of (16, 18, and 20) = 2⁴ × 3² × 5¹ = 720 Therefore, the next larger number which is divisible by all the three given numbers = 2 × 720 = 1440

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