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13 July, 03:51

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. 13 July, 04:06
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    45 seconds because the LCM is 45 for 9 and 15.
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