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8th Class Mathematics Rational Numbers Question Bank Numbers

  • question_answer
    Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. All the bells ring together after_______ seconds.

    A) 504                    

    B) 516

    C) 508                             

    D) 512        

    Correct Answer: A

    Solution :

    2 6, 7, 8, 9
    3 3, 7, 4, 9
    1, 7, 4, 3
    LCM\[=2\times 3\times 7\times 4\times 3=504.\]      


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