I don't know if I suppose to do LCM or other?I'm going to need help.

Beyonce visits her parents every 6 days and Jay-Z vists his parents every 9 days. When will it be the first day they visit there parents on the same day?

3 answers

find the LCM
What is LCM?
LCM = least common multiple

http://www.math.com/school/subject1/lessons/S1U3L3GL.html
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