Multiple Choice Questions on Four bells toll at an interval of 8 12 15 and 18 seconds respectively All the four begin to toll tog........... for IBPS RRB - Officers Exam Preparation

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Multiple Choice Questions

Four bells toll at an interval of 8 12 15 and 18 seconds respectively All the four begin to toll tog...........

Quantitative Aptitude(IBPS RRB PO) LCM, HCF
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    Four bells toll at an interval of 8, 12 , 15 and 18 seconds respectively. All the four begin to toll together. How many times will they toll together in one hour excluding the one at the start ?

    8

    Incorrect Answer

    10

    Correct Answer

    12

    Incorrect Answer

    all of the above

    Incorrect Answer
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    Explanation:

    The nest time they toll together is given by the LCM of  8,12,15 and 18 
    8= 2*2*212=2*2*315 = 3*518=2*3*3 
    LCM = 2*2*2*3*3*5 = 360
    so they will toll together every 360 seconds
    So in hour hour they will toll 3600/360 = 10 times

    Hence, option 2 is the correct answer.

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