One beacon flashes every 18 seconds and another every 24 seconds. They flash together now. After how many seconds will they flash together again?
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- Find the smallest number divisible by both 18 and 24.
- Compare multiples 18, 36, 54, 72 with multiples of 24.
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Answer: 72
We need the least common multiple of 18 and 24. It is 72, so the simultaneous flash repeats after 72 seconds.