Question

1) Six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12 seconds respectively . In 30 minutes ,how many times do they toll together ?( Excluding the one at start)

Answer 1

Answer:

First find the LCM of the time intervals.

The LCM of 2,4,6,8,10,12 is 120 (seconds)

= 2 minutes

No. of times the bells ring together is 30 minutes / 2 minutes = 15 times

Therefore the bells ring 15 times together.