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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?
13 years ago

Answers

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

13 years ago
dan
72
13 years ago
Ms. Sue
72/7 = ?

Try again.

13 years ago
dan
Oops I was thinking of 8 times 9
It's 126
13 years ago
Ms. Sue
Right.
13 years ago

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