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30 November, 15:53

Drusilla replaces the light bulb in the hall every 9 months and the air filter every 6 mont. she just replaced bot this month. After how many months will she replace both again?

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  1. 30 November, 17:11
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    The least common multiple of 9 and 6 is 18 so in 18 months she will replace the bulb for the 2nd time and the air filter for the 3rd time. It will be the first time they are replaced together.
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