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m₁ × c₁ × Δt₁ = m₂ × c₂ × Δt
200 g × 4200 J/kg°C × (100°C-t) = 250 g × 4.200 J/kg°C × (t-10°C)
= 400°C - 4t = 50°C - 5t
= 400°C + 50°C = 4t + 5t
= 450°C = 9t
t = 50°C