Use least common multiple or greatest common divisor to solve the problem.
-Planets A, B, and C orbit a certain star once every 2, 5, and 12 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?
A)19 months
B)120 months
C)60 months
D)24 months

Question

Quizplus · Accepted Answer

The planets will line up again after a number of months equal to the least common multiple (LCM) of their orbital periods. The LCM of 2, 5, and 12 is 60 months.

Use Least Common Multiple or Greatest Common Divisor to Solve