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diff --git a/3020/CH4/EX4.11/ex4_11.sce b/3020/CH4/EX4.11/ex4_11.sce
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+clc;
+clear all;
+V = 1500; // Volume of the room in cubic meters
+a1 = 0.8; // Absorption coefficient of ceiling in sabine per square meter
+s1 = 140; // Area of ceiling in square meters
+a2 = 0.03; // Absorption coefficient of walls in sabine per square meter
+s2 = 260; // Area of walls in square meters
+a3 = 0.06; // Absorption coefficient of floor in sabine per square meter
+s3 = 140; // Area of floor in square meters
+T = (0.163*V)/((a1*s1)+(a2*s2)+(a3*s3));
+a = (0.163*V)/((s1+s2+s3)*T);
+disp('s',T,'The reverberation time is')
+disp('Sabine',a,'The average absorption coefficent is')
+// Wrong answer printed for reverberation time in textbook..checked in calculator also..