//Chapter 14: Water Treatment
//Problem: 7
clc;

//Initialisation of Variables
v1 = 30     //in litres for NaCl
w = 1500    //in mg/L for NaCl

//Solution
hardness = 45 * 50 / 58.5 * 1000 / 1000
mprintf("Hardness of water is :%.2f ppm",hardness)