Answer:
Maria completed 2/3 more of the article than Joe did.
Explanation:
Maria completed 5/6 + 1/6 = 6/6 = 1 whole article.
Joe completed 2/6 of the article.
Therefore, Maria completed 1 - 2/6 = 4/6 of the article more than Joe did.
Simplifying, 4/6 is equal to 2/3.
So, Maria completed 2/3 more of the article than Joe did.