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20-10-2016
Mathematics

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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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Аноним Аноним

20-10-2016

45 seconds because the LCM is 45 for 9 and 15.

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