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diff --git a/2015/CH5/EX5.3.a/5_3a.sce b/2015/CH5/EX5.3.a/5_3a.sce
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+clc
+//initialisation of variables
+R=0.2897 //kj/kgk
+g=1.4
+t1=313 //temparature in k
+p1=20 //pressure in bar
+p2=13 //pressure im bar
+cp=1.0138 //kj/kgk
+a=5*10^-4
+//CALCULATIONS
+rc=(2/(g+1))^(g/0.4)
+t2=t1*(p2/p1)^((g-1)/g)
+c2=44.72*(cp*(t1-t2))^(0.5)
+rho=p2*100/(R*t2)
+m=rho*c2*a
+//RESULTS
+printf('mass f;ow rate and velocity of air at exit are %2fkg/s and %2fkg/m*m*m',m,rho) //textbook answer slightly varies