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-//Chapter-17,Example 7,Page 371
-clc();
-close();
-
-v= 150    //volume of NaCl 
-
-conc = 150   //concentration of NaCl
-
-amnt =v*conc *100/117    //amnt of NaCl
-
-hard = 600   //hardness of water
-
-vol= amnt*1000/hard
-
-printf("the volume of water is = %.2f litres",vol)
-
-//calculation mistake in textbook