A 2 kg block of ice at -21C and a 1 kg steel ball at a temperature of 150C are immersed in 4 kg of liquid water at 20C (the container is neglected). What is the final temperature [in C] of the system at equilibrium?

The specific heat of water is: 4190 [J/(kg K)]

The specific heat of ice is: 2100 [J/(kg K)]

The specific heat of steel is: 450 J/(kg K)

The latent heat of fusion of water (transition from ice to water) is: 334,000 J/kg

The latent heat of vaporization of water is 2,260,000 J/kg.