It is 66 kilometers west of Roy from the village of Balang Shengdu. By surveying and mapping the map, we know that the map distance from Balang Shengdu Village to Yuzixi is 3.3 cm, and the ratio between the map and reality is 1:20000, so the actual distance between the two places is 3.3 * 20000 = 66000m = 66km. Therefore, it is 66 kilometers west of Roy from Balang Shengdu Village.