Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Name the sum of inversions for opened of april 20, 2002

### Inputs:
table_name: table, columns: ['Name', 'Park', 'Country', 'Inversions', 'Opened', 'Status']

### Response:
SELECT SUM Inversions FROM table WHERE Opened = april 20, 2002