Freezing-point Depression?

Automotive antifreeze is essentially the compound ethylene glycol, C2H6O2, molar m 62.07 g/mol. suppose you fill your car radiator with 6.00L of water and then add 4.00kg of ethylene glycol. At what temperature will this mixture freeze? (water freezes at 0degrees C; the density of water is 1.00 g/mL; and the freezing point depression constant (Kf) for water is 1.86degreesC.kg/mol.)