NTSE Sample Paper NTSE SAT Practice Test-3

  • question_answer
    Four watches are ringing alarm bells in the interval of 6, 12, 15 and 18 seconds. If they start at the same time, how many times they will ring together in 4 hours?

    A)  80                                         

    B)  81

    C)  20                                         

    D)  21

    Correct Answer: B


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