Question
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?
Answers
Reiny
hint: what is the LCM of 3,7, and 18 ?
dan
72
Ms. Sue
72/7 = ?
Try again.
Try again.
dan
Oops I was thinking of 8 times 9
It's 126
It's 126
Ms. Sue
Right.