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diff --git a/443/CH20/EX20.3/20_3.sce b/443/CH20/EX20.3/20_3.sce
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+++ b/443/CH20/EX20.3/20_3.sce
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+pathname=get_absolute_file_path('20_3.sce')
+filename=pathname+filesep()+'20_3_data.sci'
+exec(filename)
+//Question 20.3 
+//hydrogen ratio
+h=(26*1)/(12*12)
+//Fuel to air ratio 
+far=0.33*(1+h)*((CO2+CO)/N) 
+//Mass flow of air
+ma=ff/(far*60)
+//Volume total (in m3/cycle)
+Vtot=(%pi/4*(d*d)*(2*l)*(cr/(cr-1)))
+//Scavanger density
+psc=(ep/(r*t))
+//Theoretical mass flow
+tmf=psc*Vtot*s
+//Scavanger efficiency
+nsc=(ma/tmf)
+//Indicated mean effective pressure (in kN/m2)
+imep = (nsc*psc)*(cr/(cr-1))*(nith*far*CV)
+printf("\n\nRESULTS\n\n")
+printf("\nScavanger efficiency: %f\n",nsc)
+printf("\nIndicated mean effective pressure %f\n",imep)
+\ No newline at end of file