9b.5 0.5 kg hot water with temperature of 50 ^oC is mixed with 2.0 kg of ice at its melting point. When thermal equilibrium is reached, it's a mixture of water and ice in 0 ^oC. Find the remaining mass of ice in the mixture. [Answer: 1.686 kg]

I have the answer, I just need a step by step explanation, please. Thank you