Find the Final Equilibrium Temperature When 20 $\degree$ C Is Added to 160 G of Coffee at 90

Find the final equilibrium temperature when 20.0 g of milk at 10.0 $\degree$ C is added to 160 g of coffee at 90.0 $\degree$ C. (Assume the specific heats of coffee and milk are the same as water and neglect the heat capacity of the container, and c_water = 1.00 cal/g· $\degree$ C = 4186 J/kg· $\degree$ C)

A) 85.3 $\degree$ C
B) 81.1 $\degree$ C
C) 71.4 $\degree$ C
D) 66.7 $\degree$ C