Question

Five bells begin to toll together and toll respectively at intervals of 6,7,8 and 12 seconds. How many times time will toll together in one hour, excluding the one at the start?

Answer 1

Answer:

So, 504 is the smallest number which is divided by 6,7,8,9,12 completely. Hence, all the bells will ring together after each 504 seconds. So, in 1hr (60×60 seconds) they will ring together=3600504=7.14 i.e. 7 times.

Do yourself from this example

Answer 2

Answer:

So, 504 is the smallest number which is divided by 6,7,8,9,12 completely. Hence, all the bells will ring together after each 504 seconds. So, in 1hr (60×60 seconds) they will ring together=3600504=7.14 i.e. 7 times.