user: Question: What is the highest Number of Households, when Per Capita Income is "$25,557", and when Population is less than "22330"?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Fulton', '$37,211', '$56,709', '$75,579', 920581.0, 376377.0]
SQL:

assistant: SELECT MAX("Number of households") FROM "Table" WHERE "Per capita income" = '$25,557' AND "Population" < 22330.0;