Posted by dan on Sunday, July 29, 2012 at 5:22pm.
Planets A, B and C orbit a certain star once every 3, 7, and 18 months respectively. If the three planets are now in the same straight line, what is the smallest number of months that must pass before they line up again?

math  Reiny, Sunday, July 29, 2012 at 5:25pm
hint: what is the LCM of 3,7, and 18 ?

math  dan, Sunday, July 29, 2012 at 5:29pm
72

math  Ms. Sue, Sunday, July 29, 2012 at 5:32pm
72/7 = ?
Try again.

math  dan, Sunday, July 29, 2012 at 5:34pm
Oops I was thinking of 8 times 9
It's 126

math  Ms. Sue, Sunday, July 29, 2012 at 5:40pm
Right.

math  ediget, Wednesday, August 12, 2015 at 8:13pm
i don't know
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