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Question

Four bells commence tolling together and then toll at intervals of 6, 7, 8 and 9 seconds respectively. After how many seconds do all the bells ring together?

A
516
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B
504
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C
508
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D
512
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Solution

The correct option is B 504
We know that bell 1 tolls after every 6 seconds, bell 2 after 7 seconds and so on. To find after how many seconds do the bells toll together, we need to find the LCM of the given numbers.
L.C.M = 2 × 3 × 7 × 4 × 3 = 504
These bells toll together after 504 seconds.

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