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28 August, 06:52

A manager turns on neon light signs. When they are turned on at the same time and they blinkat the same time. One sign blinks every 9 seconds and the other blinks every 15 seconds. In how many seconds will they blink together again?

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  1. 28 August, 09:17
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    45 seconds because the LCM is 45 for 9 and 15.
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