Write SQL query to solve given problem: Among the widowed female customers, give the income of those who has an level of education of 5 and below.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT INCOME_K FROM Demog WHERE GEOID IN ( SELECT GEOID FROM Customers WHERE EDUCATIONNUM < 5 AND SEX = 'Female' AND MARITAL_STATUS = 'Widowed' )