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14 July, 12:42

A red string of holiday lights blinks once every 3 seconds while a string of blue lgihts blink once every 4 seconds. how many times with both sets of lights blink at the same time in 1 minute

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  1. 14 July, 16:23
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    The highest common factor of 4 and 3 is 12

    one minute has 60 secs

    thus it will blink 60/12=5 times
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