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

### Instruction:
How many polls taken on different dates show an undecided percentage of 25%?

### Inputs:
table_name: table, columns: ['Date of opinion poll', 'Conductor', 'Sample size', 'For', 'Against', 'Undecided']

### Response:
SELECT COUNT Date of opinion poll FROM table WHERE Undecided = 25%