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2kg * (100C-60C) = m2 * (60C-40C)
2kg * 40C = m2 * 20C
80kg = 20 m2
m2 = 4kg
2kg × (100-60)°C = m2 × (60-40)°C
2kg × 40°C = m2 × 20°C
80 = 20 m2
m2 =
m2 = 4 kg