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diff --git a/1427/CH4/EX4.5/4_5.sce b/1427/CH4/EX4.5/4_5.sce
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+//ques-4.5
+//Determining BOD of given sample
+clc
+V=25;//Volume of water sample (in mL)
+v1=30;//volume of ferrous ammonium sulphate(FAS) in blank (in mL)
+v2=18;//volume of FAS in sample (in mL)
+n=0.1;//normality of FAS
+//1000mL of 1N FAS = 8g oxygen
+O=(8*(v1-v2)*n)/1000;//Oxygen in 25mL of water (in g)
+O=O*(1000/25);//Oxygen in 1L of water (in g)
+printf("COD of given sample is %d ppm.",O*1000);