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

### Instruction:
How many legs were won when 6 legs were lost, the 180s was 0, and the 3-dart average was less than 69.72?

### Inputs:
table_name: table, columns: ['Player', 'Played', 'Sets Won', 'Sets Lost', 'Legs Won', 'Legs Lost', '100+', '140+', '180s', 'High Checkout', '3-dart Average']

### Response:
SELECT COUNT Legs Won FROM table WHERE Legs Lost = 6 AND 180s = 0 AND 3-dart Average < 69.72