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diff --git a/3878/CH21/EX21.3/Ex21_3.sce b/3878/CH21/EX21.3/Ex21_3.sce
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+clear
+// Variable declaration
+T_ra=21// The temperature of the returning air 
+H=50// % saturation
+T_d=28// The dry bulb temperature in °C
+T_w=20// The wet bulb temperature in °C
+m_a=20// The mass flow rate of returning air in kg/s
+m_b=3// The mass flow rate of outside air in kg/s
+x_ra=0.0079// The moisture content in kg/kg
+x_oa=0.0111// The moisture content in kg/kg
+h_a=41.8// The enthalpy in kJ/kg
+h_b=56.6// The enthalpy in kJ/kg
+
+// Calculation
+// Method (b)
+t_c=((T_ra*m_a)+(T_d*m_b))/(m_a+m_b)// °C
+g_c=((x_ra*m_a)+(x_oa*m_b))/(m_a+m_b)// kg/kg
+h_c=((h_a*m_a)+(h_a*m_b))/(m_a+m_b)// kJ/kg dry air
+printf("\n \nThe condition of the mixture,t_c=%2.1f°C",t_c)
+
+printf("\n \n  g_c=%0.4f kg/kg",g_c)
+
+printf("\n \n  h_c=%2.1f kJ/kg dry air",h_c)
+