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diff --git a/409/CH7/EX7.4/Example7_4.sce b/409/CH7/EX7.4/Example7_4.sce
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+clear ;
+clc;
+// Example 7.4
+printf('Example 7.4\n\n');
+//Page no. 180
+// Solution
+
+n_un= 7 ;// Number of unknowns in the given problem- 3 values of xi and 4 values Fi
+n_ie = 5 ;// Number of independent equations
+// Summary of independent equations
+// Three material balances:CH4,C2H6 and N2
+// One specified ratio: moles of CH4 to C2H6 equal 1.5 
+// One summation of mole fraction in mixture equals 1
+d_o_f = n_un-n_ie ;// No. of degree of freedom
+
+printf('Number of degree of freedom for the given system is  %i .\n',d_o_f);
+\ No newline at end of file