the red light bulbs off christmas light flashes every 8 seconds the blue bulbs flash every 9 s and green bulbs flash 10 seconds if they all startingto flash together and every how many minutes will they flash simultaneously
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Answer:
This is a least common multiple problem. use the prime factors of 8,9 and 10
8 = 2x2x2
9 = 3x3
10 = 2x5
so the least common multiple is 2*2*2*3*3*5 = 360 seconds or 6 minutes