Question

Four bells ring at intervarls of 7minutes,9 minutes,12minutes and 30minutes they rang together at 11:59am what time will they ring together again

Answer 1

Answer:

After 58 min

Step-by-step explanation:

At 12:56

Answer 2

Answer:

9:59 am (next day)

Step-by-step explanation:

The four bells ring at 7 minutes, 9 minutes,12 minutes and 30 minutes intervals.

They rang together at 11:59 am

By finding the LCM we can know when the bells rang together the next time..

7 = 7

9 = 3²

12 = 2² x 3

30 = 2 x 3 x 5

taking LCM of (7,9,12,30) =7 x 3² x 2² x 5 = 1260 min (21 hrs)

all four will ring together after 21 hrs