Question

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 all toll together.

Answer 1

firstly we take lcm of 2,4,6,8,10,12
lcm =120 second
hence in 30 minutes,they would toll 30*60/120= 15 times
so total tolls together = 1+15 = 16 times
(we add 1 because they firstly toll together)