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+1 vote
43.8k views
in Mathematics by (106k points)

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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