Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. All the bells ring together after ............ seconds

504

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516

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508

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512

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Solution

The correct option is B 504
$2 | 6, 7, 8, 9 - ------- -$
$3 | 3, 7, 4, 9 - ------- -$
$| 1, 7, 4, 3 - ------- -$
$L C M = 2 \times 3 \times 7 \times 4 \times 3 = 504$ .

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