Lindsey went to the beach every 7 days and molly went to the beach every 4 days. How often did they see each other at the beach?
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Lindsey goes to the beach every 7th day.

Molly goes to the beach every 4th day.

The L.C.M of 7 and 4 is 28.

So, they meet every 28th day.
by Level 7 User (25.7k points)

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