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+//Chapter 14: Water Treatment
+//Problem: 9
+clc;
+
+//Given Constants For Specific Elements
+Fe = 56
+S = 32
+O = 16
+
+//Solution
+hardness = Fe + S + O * 4
+hardn= (hardness * 215 )/100
+
+mprintf("215 ppm of hardness is : %.1f ppm of FeSO4",hardn)