three bells toll at intervals of 9,12,15 minutes of they start tolling togeather after what time will they next toll togeather.
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9 = 3 x 3 = 3²
12 = 2 x 2 x 3 = 2² x 3
15 = 3 x 5
=> LCM (9, 12, 15) = 2²x 3² x 5 = 180
=> the bells will toll together after 180 minutes.
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