When processing a batch of parts, the ratio of completed parts to the total number of parts is 1:3. If 150 more parts are processed, then the number of completed parts is the same as the number of remaining parts. How many parts are there in this batch?
加工一批零件，已完成个数与零件总个数的比是1：3，如果再加工150个，那么完成个数与剩下的个数同样多，这批零件有多少个？
<result>90</result>