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diff --git a/3685/CH20/EX20.5/Ex20_5.sce b/3685/CH20/EX20.5/Ex20_5.sce
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+clc
+// Given that
+F = 610 // Net brake load in N
+N = 350 // Speed in rpm
+d = 20 // Bore in cm
+L = 30 // Stroke in cm
+imep = 275 // Mean effective pressure in kN/m^2
+D = 1 // Brake diameter in m
+m_o = 4.25 // Oil consumption in kg/h
+cv = 44 // Calorific value in MJ/kg
+printf("\n Example 20.5\n")
+i_p = imep*1000*L*(10^-2)*(%pi/4)*((d*(10^-2))^2)*N/60000
+b_p = (2*%pi*(F*(D/2))*N)/60000
+n_m = b_p / i_p
+n_th = i_p *3600/(m_o*cv*1000)
+n_br = n_th*n_m
+printf("\n Indicated power = %f kW\n Brake power = %f kW\n Mechanical efficiency = %f percent,\n Indicated thermal efficiency = %f percent,\n Brake thermal efficiency = %f percent",i_p,b_p,n_m*100,n_th*100,n_br*100)
+
+
+