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diff --git a/2063/CH7/EX7.9/7_9.sce b/2063/CH7/EX7.9/7_9.sce
new file mode 100755
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+clc
+clear
+//Input data 
+I=45;//Power developed by two cylinder internal combustion engine operating on two stroke principle
+N=1100;//Speed in rpm
+M=6;//Mean effective pressure in kgf/cm^2
+r=1.3;//Ratio of stroke to the bore
+nc=2;//Number of cylinders
+
+//Calculations
+d=((I*4500*4)/(M*(r/100)*3.14*N*nc))^(1/3);//Diameter of the bore in cm
+l=1.3*d;//Stroke length in cm
+
+//Output
+printf('(a)The bore diameter of the cylinder is %3.2f cm\n (b)Stroke length of the piston is %3.2f cm',d,l)