Question

The PTA set up booths at the local bike race. The volunteers placed a race marker in the ground every five thousand yards. Every eight thousand yards, the volunteers set up a refreshment station. What is the shortest distance a participant will have to travel to see both a race marker and a refreshment station at the same location? Fill in the blank. ________ thousand yards. (LCM)

Answer 1

So I was always taught to list out the multiples.
5,000:5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000

8,000:8,000 16,000 24,000 32,000 40,000

You can see more clearly that the first multiple they share is 40,000 yds
Hope that helps