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 (PCS) LCM, HCF

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.

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

=> 20+1 = 21

Hence, option 2 is the correct answer.

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