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diff --git a/2966/CH1/EX1.4.90/1_4_90.sce b/2966/CH1/EX1.4.90/1_4_90.sce
new file mode 100644
index 000000000..208ab4b57
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+++ b/2966/CH1/EX1.4.90/1_4_90.sce
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+//water//
+//page 1.90 example 4//
+clc
+Hardness=480//Hardness of water(mg/lit) or ppm//
+H=Hardness/100//Hardness of water(gms/lit)//
+volume_NaCl=300//Volume of NaCl//
+conc_NaCl=150//% 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