The specific heat of water = $4200 {\mathrm{Jkg}}^{-1}{K}^{-1}$  and the latent heat of ice = $3.4\times {10}^{5}Jk{g}^{-1}$. 100g of ice at $0°C$ is placed in 200g of water at $25°C$ . The amount of ice that will melt as the temperature of water reaches $0°C$  is close to (in grams)