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diff --git a/2966/CH1/EX1.4.51/1_4_51.sce b/2966/CH1/EX1.4.51/1_4_51.sce
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+++ b/2966/CH1/EX1.4.51/1_4_51.sce
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+//water//
+//page 1.51 example 4//
+clc
+Hardness=400//Hardness of water(mg/lit) or ppm//
+H=Hardness/100//Hardness of water(gms/lit)//
+volume_NaCl=100//Volume of NaCl//
+conc_NaCl=60//% NaCl consumed by zeolite bed//
+Wt_per_Litre=conc_NaCl*10//gms NaCl consumed by zeolite bed per litre//
+total_wt=Wt_per_Litre*volume_NaCl//total gms NaCl consumed by zeolite bed//
+CaCO3_equivalent=total_wt*50/58.5//in terms of (gms/lit)//
+volume_hardwater=CaCO3_equivalent/H
+printf("\nQuantity of water softened using zeolite bed is %.f litres",volume_hardwater);
+\ No newline at end of file