Question

Three bells toll at intervals of 12, 18 and 21 minutes respectively. If they start
tolling together, after what time will they next toll together?​

Answer 1

Answer:

we need to find LCM(12,18,20)

12 =   2 power 2 x 3

18 =   3 power 2 x 2

20 =  2 power 2 x  5

lcm =  2 power 2  x  3 power2  x  5

All three bell will rang together after 180 min or 3 hours

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