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5 of them.The least common multiple of 12 and 18 is 36. Further common multiples include 72, 108, 144, 180, and 216. Thus, there are five numbers less than 215 that are divisible by both 12 and 18.
There are five numbers: 36, 72, 108, 144, 180.

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Q: How many numbers less than 215 are divisible by both 12 and 18?
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