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

### Instruction:
What is the most number of families in regions where average family size is 2.7?

### Inputs:
table_name: table, columns: ['Region of USSR', 'Number of families', 'Number of people', 'Average family size', '% of total deportees']

### Response:
SELECT MAX Number of families FROM table WHERE Average family size = 2.7