Question

The bells at Kings school ring every 6 mins. at queens school the bell ring every 5 mins. at princess school the bell rings every 9mins. all three bells ring together at 8:30am. when is the next time the bells of the three schools will ring together?

Answer 1

even though it is throws time in there, it is a simple lowest common multiple problem. Just think the interval numbers separate from the start time.

using the table method is the easiest way to find this. I tried copying a table i made but could not. you will find the LCM of 5, 6, and 9 is 90. so 8:30am plus 90 minutes would be 10:00am