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10 May, 03:31

6th grade math

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

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Answers (2)
  1. 10 May, 04:07
    0
    They will both be replaced the 18th month.
  2. 10 May, 05:46
    0
    She will replace both at the same time in 18 months

    Step-by-step explanation:

    The first thing you have to do to find when she will change them at the same time, is to try with multiples of both, untill they match.

    Hall Closet = every 9 months

    Air Filter = every 6 months

    1) 9-18-27-36-45

    2) 6-12-18

    We find that in the 18th month he will change both of them.
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