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

### Instruction:
What is the weight with the shape of scalloped, and that is a size of 20mm (across scallops)?

### Inputs:
table_name: table, columns: ['Denomination', 'Metal', 'Weight', 'Shape', 'Size']

### Response:
SELECT Weight FROM table WHERE Shape = scalloped AND Size = 20mm (across scallops)