Threes bells toll at interval of 12,18,20 minutes respectively if they start tolling together after what time will they next toll together
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all three bell will rang together after 180 min or 3 hours
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First bell toll after = 12 min
Second bell toll after = 18 min
Third bell toll after = 20 min
The next time that the three bells toll together is the LCM of 12,18,20
LCM :-
12 = 2 × 2 × 3
18 = 2 × 3 × 3
20 = 2 × 2 × 5
LCM = 2 × 2 × 3 × 3 × 5
LCM = 180
Therefore , the three bells toll after 180 min ( or ) 3 hours.
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