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There is a sting of red lights strung around a window. The red lights blink ever 3 seconds and the blue lights blink every 5 seconds. How many times will they blink at the same time?

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Answer:

It will be about six times!

Step-by-step explanation: Well you could count by threes and Fives and see your answer, 3,6,9,12,15, and so on and fives 5,10,15 and you have one match. 18, 21, 24, 27, 30 and 20, 25, 30. Two matches. They will blink at the same time about six times. 

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