six bells commence tolling together and toll at intervals of 2..., HCF & LCM, General Mathematics

Question:Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 second respectively. In 30 minutes, how many times do they toll together ?

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+ AnswerD

+ Explanationsolution:
L.C.M. of 2, 4, 6, 8, 10, 12 is 120.
So, the bells will toll together after every 120 seconds i.e. 2 minutes.
In 30 minutes, they will toll together in `(30/2)` + 1 =16 times.

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Question:Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 second respectively. In 30 minutes, how many times do they toll together ?

A 4

B 10

C 15

D 16

D