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    Question

    LCM of two numbers is 8 times their HCF. The product of

    the numbers is 10240. What will be the maximum possible difference between the numbers?
    A 178 Correct Answer Incorrect Answer
    B 252 Correct Answer Incorrect Answer
    C 256 Correct Answer Incorrect Answer
    D 235 Correct Answer Incorrect Answer

    Solution

    ATQ, Let HCF of two numbers be ‘x’ So, LCM of two numbers = 8 × x = 8x Or, x × 8x = 10240 Or, 8x² = 10240 Or, x² = 1280 Or, x = √1280 = 35.78 (Approx 36) LCM of two numbers = 36 × 8 = 288 Let two numbers be ‘36a’ and ‘36b’, where ‘a’ and ‘b’ are co-prime numbers. So, 36ab = 288 Or, a × b = 8 So, when a = 1 and b = 8, then difference will be maximum Desired difference = 36 × 8 – 36 × 1 = 252

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