Sam takes 20 days to write an article, Taylor takes 10 days to write an article and Kelly also takes 10 days to write an article.
How long will it take the three of them to write one article if they work together?
In one day Sam can write 1/20 of an article, Taylor and Kelly can both write 1/10.
So in one day, in total, they can write 1/20 + 1/10 + 1/10 = 1/4.
Therefore one article will take 4 days.
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