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OpenStudy (anonymous):
in building one a light flashes every 4 seconds in building 2 a light flashes every 8 seconds in building 3 light flashes every 12 seconds after how many seconds do they flash together for the first time
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OpenStudy (anonymous):
you find what number is common (the lowest) between these 3 numbers. so 4*3 2*6 12*1 and your answer is 12
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