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:

L.C.M. of 2, 4, 6, 8, 10, 12 is 120.

So, the bells will toll together after every 120 seconds(2 minutes).

In 30 minutes, they will toll together

30/20 + 1 = 16 times

So, The bell will ring 16 times