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28 November, 10:52

Two neon signs are turned on at the same time. both signs blink as they are turned on. one sign blinks every 9 second's. the other every 15 seconds. in how many seconds will they blink together again

Answers (2)
  1. L
    28 November, 14:05
    0
    They will blink together again at 45 seconds
  2. M
    28 November, 14:45
    0
    For this question you have to find the lowest common multiple of 9 and 15. there are a few ways to do that. in this case the lowest common multiple (LCM) is 45. this means that both lights will blink at the same time again after 45 seconds.
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