Chicago's public employee pension funds will run out of money within 15 years.

Center For Pension Integrity reports:

Chicago’s public employee pension plans — police officers, firefighters, teachers, city laborers and municipal employees — are severely underfunded — by $28.9 billion and growing. That number is nearly four times the entire annual City of Chicago budget!
By 2020, just five years from now, there will be a higher number of City employees entitled to receive pension benefits than there will be active city employees.

Even Common Core math can't solve this problem.