Answers

  • Brainly User
2014-09-09T22:24:26+05:30
Bells will toll together after every period equal to common multiples of these for mbers.
Afte 4pm,bells will toll for first time after  a period equal to Least Common Multiple of 9, 15, 18, 21 which is 630 seconds, i.e., at 10 min 30 sec past 4pm.
0
2014-09-09T23:45:40+05:30
Bell will rang alltogether after 630sec of 4pm.ie tthe L.C.M of9,15,18,and21
0