Question 868091: a blue neon light blinks every 4 seconds. a red one blinks every 5 seconds. while a green one blinks every 6 seconds. how many times will they blink together in half an hour.
Answer by htmentor(1343)   (Show Source):
You can put this solution on YOUR website! In order to solve, we first need to find the LCM (least common multiple) of 4, 5, and 6
The prime factors are
4: 2,2
5: 1,5
6: 1,6
So the LCM is 60.
That means every 60 seconds (1 minute) they blink together.
There are 30 minutes in a half hour, so they blink together 30 times.
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