Table: list of schools in the wellington region
Question: What is the ratio of the total number of students in coed schools to the total number of students in single-gender schools in the Wellington region?
Step 1 (Operation, Indexing): gender
Step 2 (Operation, Grouping): gender
Step 3 (Reasoning, Aggregating): COUNT, coed and single-gender
Step 4 (Reasoning, Arithmetic): ratio, coed and single-gender
Answer: 20:0