Question

three bells ring at intervals of 10,12and 15 minutes.if they rang together at 8:30a.m., when will they ring together again?
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Answer 1

Answer:

Lowest common multiple of 10,12,and 15

10 = 2 x 5

12 = 2 x 2 x 3

15 = 3 x 5

LCM [ 10,15,20 ] = 60

THE BELL WILL RING AFTER 60 MINUTES