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6 June, 13:00

If a string of red holiday lights blinks once every 3 seconds while a string of blue lights blink once every 4 seconds. how many times both sets of lights blink at the same time in 1 minutes?

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  1. 6 June, 15:25
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    5 times

    the lcm of 3 and 4 is 12

    1 minute = 60 seconds

    60 divided by 12 is 5
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