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

### Instruction:
Which Avg/G that has a Name of opponents, and an Effic smaller than 129.73?

### Inputs:
table_name: table, columns: ['Name', 'GP-GS', 'Effic', 'Cmp-Att-Int', 'Avg/G']

### Response:
SELECT SUM Avg/G FROM table WHERE Name = opponents AND Effic < 129.73