Six bells commence tolling together and toll at the intervals of 2, 4, 6, 8, 10, 12 seconds respectively. In 60 minutes how many times they will toll together ?



Six bells commence tolling together and toll at the intervals of 2, 4, 6, 8, 10, 12 seconds respectively. In 60 minutes how many times they will toll together ?

A. 16

B. 15

C. 31

D. 30

Answer : C. 31


Explanation:

    LCM of 2 , 4 , 6 ,8 , 10 , 12 is 120 seconds, that's 2 minutes.
    Now 60 / 2 = 30
    Adding one bell at the beginning it'll be 30 + 1 = 31.



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