A 5-Gallon Container of Water (Approximately 20 Kg)having a Temperature $\degree$

A 5-gallon container of water (approximately 20 kg) having a temperature of 212 $\degree$ F is added to a 50-gallon tub (approximately 200 kg) of water having a temperature of 50 $\degree$ F.What is the final equilibrium temperature (in $\degree$ C) of the mixture?

A) 54
B) 36
C) 18
D) 66
E) 14