Three neighbors mow their lawns at different intervals during the summer months. The first one mows every 5 days, the...

Three neighbors mow their lawns at different intervals during the summer months. The first one mows every 5 days, the second every 7 days, and the third every 10 days. a. How frequently do they mow their lawns on the same day? b. How many times does each neighbor mow in between the times when they all mow together?