The pattern calls for 3 (3, 5, 6, 7) hanks of worsted in color A and 2 (2, 4, 5, 6) hanks of worsted in color B. These were calculated together for total yardage above.

From the pattern booklet:
“El Cerro (’the hill’), located on and around the only hill in Montevideo, is characterized by its steep streets, reminiscent of those of San Francisco or Seattle. Situated on the bay, this industrial neighborhood offers some of the best views of the city. El Cerro was once the site of many of Montevideo’s largest factories and slaughterhouses. While most of these have since moved away, a number of local industries, including Malabrigo Yarn, are currently based there.”