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+//Chapter 14: Water Treatment
+//Problem: 1
+clc;
+
+//Declaration of Variables
+wt_CaSO4 = 160 //in mg/L
+
+//Solution
+hardness = 100 * wt_CaSO4 / 136.
+mprintf("The hardness is:%.2f mg/L of CaCO3 eqv.",hardness)