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10th Class Mathematics Real Numbers Question Bank MCQs - Real Numbers

  • question_answer
    4 Bells toll together at 9.00 am. They toll after 7,8,11 and 12 seconds respectively. How many times will they toll together again in the next 3 hours?

    A) 3

    B) 4

    C) 5

    D) 6

    Correct Answer: D

    Solution :

    Sol.      [d] LCM of\[\text{7,8,11,12}=\text{1848}\]                             
    \[\therefore \] Bells will toll together after every 1848 sec.              
    \[\therefore \] In next 3 hrs. number of times the bells will toll together
                            \[=\frac{3\times 3600}{1848}=5.84\]
    = 6 times.             


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