Question

there are 4 bells which toll at intervals of 3,7,12,14seconds respectively. the four bells begin to toll at 12 o clock.when will they next toll together and how often they do so in 14 minutes?

Answer 1

3

7

12 = 2 x 2 x 3

14 = 2 x 7

LCM = 2 x 2 x 3 x 7 = 84

they all will ring together after 84 seconds and will ring (14x60) / 84 times in 14 mins = 10 times together in 14 mins