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Planets X, Y and Z take 360, 450 and 540 days, respectively, to rotate around the same sun. If the three planets are lined up in a ray having the sun as its endpoint, what is the minimum positive number of days before they are all in the exact same locations again?

 Apr 1, 2019
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You will need to find the LCM of 360    450   540     (LCM = least common multiple)     ...it is   5400 days (I used an online LCM calculator)

 Apr 1, 2019

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