Posted by **sean** on Wednesday, October 3, 2012 at 8:48am.

a red light winks every 6 seconds, a white one every 10 seconds, and a green one every 14 seconds. how often they wink together?

- math -
**Steve**, Wednesday, October 3, 2012 at 9:59am
6 = 2*3

10 = 2*5

14 = 2*7

LCM(6,10,14) = 2*3*5*7 = 210

so, every 210 seconds they will blink at the same time

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