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    Question

    Find the smallest number which, when divided by 7, 9 and

    12 leaves a remainder of 5 in each case.
    A 257 Correct Answer Incorrect Answer
    B 335 Correct Answer Incorrect Answer
    C 265 Correct Answer Incorrect Answer
    D 300 Correct Answer Incorrect Answer

    Solution

    Let the required number be N. Then N тИТ 5 is divisible by 7, 9, and 12. So N тИТ 5 = LCM(7, 9, 12) ├Ч k Find LCM(7, 9, 12): 7 is prime; 9 = 3┬▓; 12 = 2┬▓ ├Ч 3 LCM = 2┬▓ ├Ч 3┬▓ ├Ч 7 = 4 ├Ч 9 ├Ч 7 = 252 For smallest positive such N, take k = 1: N тИТ 5 = 252 N = 252 + 5 = 257 Answer: 257.

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