Question 965736: A christmas tree is decorated with lights coloured green, red ane yellow which light up after 9 seconds, 12seconds and 6 seconds respectively.how many times will the three lights, light up together in 1 hour?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! A christmas tree is decorated with lights coloured green, red ane yellow which light up after 9 seconds, 12seconds and 6 seconds respectively.
how many times will the three lights, light up together in 1 hour?
:
find the least common multiple of 9,12,6, every 36 seconds, they all light together
Change 1 hr to 3600 seconds
 = 100 times all lit together in one hr
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