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diff --git a/443/CH20/EX20.4/20_4.sce b/443/CH20/EX20.4/20_4.sce
new file mode 100755
index 000000000..68d9ccf78
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+++ b/443/CH20/EX20.4/20_4.sce
@@ -0,0 +1,22 @@
+pathname=get_absolute_file_path('20_4.sce')
+filename=pathname+filesep()+'20_4_data.sci'
+exec(filename)
+//Question 20.4 
+//psc (in kg/m3)
+psc=ep/(r*t)
+//Mass of air (in kg/cycle)
+ma=nsc*V*psc
+//Scavanging ratio Rsc
+Rsc=(cf/(s*V*psc))
+//Trapping efficiency ntr
+ntr=nsc/Rsc
+//Brake power (in kW)
+bp=((ma*CV*nbth*s*far)/60)
+//the bsfc (in kg/kWh)
+bsfc=(cf*60*far/(bp))
+//Short circuting (in kg/h)
+sc=(cf*(1-ntr)*(60*far))
+printf("\n\nRESULTS\n\n")
+printf("\nbrake power: %f\n",bp)
+printf("\nthe bsfc %f\n",bsfc)
+printf("\nShort Circuting %f\n",sc)
+\ No newline at end of file