To find out when Noah will water and trim the houseplants on the same day, we need to determine the least common multiple (LCM) of the two time intervals: 8 days (watering) and 16 days (trimming).
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List the multiples of each number:
- Multiples of 8: 8, 16, 24, 32, 40, ...
- Multiples of 16: 16, 32, 48, ...
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Identify the smallest common multiple:
- The first multiple that appears in both lists is 16.
Thus, the least common multiple of 8 and 16 is 16.
Therefore, Noah will water and trim the houseplants together in 16 days.