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?
:
find the least common multiple of 9,12,6, every 36 seconds, they all light together
Change 1 hr to 3600 seconds
{{{3600/36}}} = 100 times all lit together in one hr