Four ice cubes at exactly 0 ∘C with a total mass of 51.0 g are combined with 155 g of water at 90 ∘C in an insulated container. (ΔH∘fus = 6.02 kJ/mol, cₐₜₑᵣ = 4.18J/g⋅∘C)

If no heat is lost to the surroundings, what is the final temperature of the mixture?