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29 December, 19:31

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many seconds will they blink together again? Show Work

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  1. 29 December, 19:56
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    15+15+15=45

    9+9+9+9+9=45
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