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//Chapter-17,Example 2,Page 369
clc();
close();

m1= 136   // mass of FeSO4

m2 = 100  //mass of CaCO3

//for 100 ppm hardness FeSO4 required per 10^6 parts of water is 136 parts
//for 200 ppm hardness

amt= m1*200/m2

printf("the amount of FeSO4 required is = %.f mg/l",amt)