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?
5 answers
hint: what is the LCM of 3,7, and 18 ?
72
72/7 = ?
Try again.
Try again.
Oops I was thinking of 8 times 9
It's 126
It's 126
Right.
6 answers