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diff --git a/257/CH5/EX5.15/example_5_15.sce b/257/CH5/EX5.15/example_5_15.sce
new file mode 100644
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+++ b/257/CH5/EX5.15/example_5_15.sce
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+s=%s
+
+ //to find C/E
+
+a=10/(s*(s+1))
+b=a/(1+(a*0.5*s))
+c=b*(s+4)                          //shifting the summer to the left 
+
+//(s^2+6*s)/(10*(s+4)) * C == E + 3/(s+4)*(E+C)
+Y= 10*(s+7)/(s^2+6*s-30)               //solving the above equation
+
+disp(Y,"C/E = ")
+
+// to find C/R
+
+d=c/(1+c*1)                           //using the associative law, exchange two summing points
+e=1+(3/(s+4))
+X= d*e
+
+disp(X," C/R = ")
+
+// to find C/N if r(s)=0
+
+x= (-0.5*s)-(s+4)
+k=10/(s*(s+1))
+f=k*x                 //removing the summing point
+V=1/(1-f)
+disp(V,"C/N = ")