user: Question: How many households have a median family income of $60,400?
Columns: ['County or City', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Arlington', '$57,724', '$94,880', '$126,947', 207627.0, 98050.0]
SQL:

assistant: SELECT SUM("Number of households") FROM "Table" WHERE "Median family income" = '$60,400';