Multiple Choice Questions on Four bells commence tolling together and toll at the intervals of 3 9 12 15 seconds resp In 60 minut........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Four bells commence tolling together and toll at the intervals of 3 9 12 15 seconds resp In 60 minut...........

Quantitative Aptitude ( CCS) LCM, HCF
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    Four bells commence tolling together and toll at the intervals of 3,9,12,15 seconds resp. In 60 minutes how many times they will toll together.

    20

    Incorrect Answer

    21

    Correct Answer

    24

    Incorrect Answer

    30

    Incorrect Answer
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    Explanation:

    LCM of 3, 9, 12, 15 = 180s = 3m
    In 60m = 60/3 = 20

    => 20+1 = 21

    Hence, option 2 is the correct answer.

    By: Amit Kumar
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