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+clc;

+//Example 7.4

+//page no 67, fig 7.5

+printf("Example 7.4 page no,fig 7.5\n\n")

+//Given pollutant in ppm in liquid stream ,some pollutant in discharge volume 

+//calculate what fraction of liquid bypass

+//liquid stream having 600 ppm pollutant

+//pollutant in the discharge stream is 50 ppm

+//if B =factio of liquid bypassed,then 1-B= fraction of liquid treated

+//performing a pollutant mass balance around point2 in fig. 7.5

+B=poly([0],'x');

+N=roots((1-B)*0+600*B-50*1)

+printf("\n\n calculation:\n  calculation  of liquid  bypassed B=%.4f ",N(1));