Question

i) Three bells ring at on intesval of 12, 15 and 18 minutes
respectively. If the bells ring at 11:30 am, When will they
riny together again ?​

Answer 1

here is ur Answer

Step-by-step explanation:

In simple way, we need to find the lowest number, which is fully divisible bh 10, 15 and 20. So let's find the PCM of these 3, and that is 60mins.

So 60 minutes after 12 o'clock, all 3 bells will ring together again, ie at 1 o'clock.

Another way, non math way, to solve this is

BellA will ring at 12:00, 12:10, 12:20, 12:30, 12:40, 12:50, 1:00

BellB will ring at 12:00, 12:15, 12:30, 12:45, 1:00

BellC will ring at 12:00, 12:20, 12:40, 1:00

So, after ringing together at 12 o'clock, the bells will again ring together at 1 o'clock.