Fewpal
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Three bells toll at intervals of 9, 12, 15 minutes respectively. If they start tolling together, after what time they next toll together?

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Solution:
9 = 3 x 3 = 32
12 = 2 x 2 x 3 = 22 x 3
15 = 3 x 5
=> LCM (9, 12, 15) = 22 x 32 x 5 = 180
=> the bells will toll together after 180 minutes.

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