Question

Three bells toll at intervals of 9 12 15 minutes respectively if they start tolling together after what time will they next toll together

Answer 1

Answer:

take lcm of 9 12 15

which will be 180

so answer is 180 sec

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Answer 2

Answer:

Given that three bells toll at intervals of 9,12,15 minutes.

Prime factorization of 9 = 3 * 3

Prime factorization of 12 = 2 * 2 * 3

Prime factorization of 15 = 3 * 5

LCM(9,12,15) = 3 * 3 * 2 * 2 * 5

                    = 180.

Therefore the bells will ring together after 180 minutes (or) 3 hours.

Hope this helps!

Step-by-step explanation: