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

### Instruction:
What is the total of Matches with Goals of 18, and an Average larger than 0.55?

### Inputs:
table_name: table, columns: ['Goalkeeper', 'Goals', 'Matches', 'Average', 'Team']

### Response:
SELECT SUM Matches FROM table WHERE Goals = 18 AND Average > 0.55