You see, for these calorimetry problems with ice and warm water, just remember the key principle — the heat lost by water equals the heat gained by ice for melting and then warming up. Break it into steps: first, ice melts at 0°C absorbing latent heat, then that resulting water warms up to the final mix temperature. Honestly, after struggling with the same chapter, I realised drawing a quick sketch of the energy flow diagram on my father's old stationery pad makes it click. Eta ekdom clear hoye jay, believe me.
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