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diff --git a/3685/CH20/EX20.4/Ex20_4.sce b/3685/CH20/EX20.4/Ex20_4.sce
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+clc
+// Given that
+T = 20 // Time in minute
+F = 680 // Net brake load in N
+N = 360 // Speed in rpm
+mep = 3 // Mean effective pressure in bar
+f = 1.56 // Fuel consumption in kg
+m_w = 160 // Cooling water in kg
+t = 57 // Water inlet temperature in degree centigrade
+r = 30 // Air used per kg of fuel
+t_r = 27 // Room temperature in degree centigrade
+t_e = 310 // Exhaust gas temperature in degree centigrade
+d = 210 // Bore in mm
+L = 290 // Stroke in mm
+D = 1 // Brake diameter in m
+cv = 44 // Calorific value in MJ/kg
+m_s = 1.3 // Steam formed per kg fuel in the exhaust in kg
+s = 2.093 // Specific heat of steam in the exhaust in kJ/kgK
+s_d = 1.01 // Specific heat of dry exhaust gases in kJ/kgK
+printf("\n Example 20.4\n")
+i_p = mep*100*L*(10^-3)*(%pi/4)*((d*(10^-3))^2)*N/60
+b_p = (2*%pi*(F*(D/2))*N)/60000
+n_m = b_p / i_p
+h = f*cv*1000
+i_pe = i_p*T*60
+e_w = m_w * 4.187*(t-32)
+m_t = f*r + f
+m_s_ = m_s*f
+m_d = m_t - m_s_
+e_d = m_d * s_d * (t_e-t_r)
+e_s = m_s_*(4.187*(100-t_r) + 2257.9 +s*(t_e-100))
+e_t = e_s + e_d
+e_Un = h - (i_pe + e_w + e_t)
+printf("\n Indicated power = %f kW\n Brake power = %f kW",i_p,b_p)
+printf("\n Energy release by combustion of fuel is %f kJ \n 1. Energy equivalent of ip is %f kJ (%f percent)\n 2. Energy carried away by cooling water is %f kJ (%f percent),\n 3. Energy carried away by exhaust gases is %f kJ (%f percent),\n 4. Unaccounted energy loss (by difference) is %f kJ (%f percent)",h,i_pe,(i_pe/h)*100,e_w,(e_w/h)*100,e_t,(e_t/h)*100,e_Un,(e_Un/h)*100)
+
+
diff --git a/3685/CH20/EX20.4/Ex20_4.txt b/3685/CH20/EX20.4/Ex20_4.txt
new file mode 100644
index 000000000..a74c0b2e9
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+ 
+ Example 20.4
+
+ Indicated power = 18.080023 kW
+ Brake power = 12.817698 kW
+ Energy release by combustion of fuel is 68640.000000 kJ 
+ 1. Energy equivalent of ip is 21696.027361 kJ (31.608431 percent)
+ 2. Energy carried away by cooling water is 16748.000000 kJ (24.399767 percent),
+ 3. Energy carried away by exhaust gases is 19333.323828 kJ (28.166264 percent),
+ 4. Unaccounted energy loss (by difference) is 10862.648811 kJ (15.825537 percent) 
+\ No newline at end of file