Asked by dan

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?
Answered by Reiny
hint: what is the LCM of 3,7, and 18 ?

Answered by dan
72
Answered by Ms. Sue
72/7 = ?

Try again.

Answered by dan
Oops I was thinking of 8 times 9
It's 126
Answered by Ms. Sue
Right.
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