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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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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?

User TheWebGuy
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1 Answer

6 votes
5 times
the lcm of 3 and 4 is 12
1 minute = 60 seconds
60 divided by 12 is 5
User Canton
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