20 At a certain time, 55 vehicles enter junction A; 20, 15 and 20 vehicles leave the intersections B, C and D, respectively. f3 a) In this period of time fi, fi, fa, fa. fs 5A 15 f2 Find out how many vehicles pass through each of the streets by creating and solving a system of linear equations. b) If the BC road is blocked, in what range should the number of cars crossing AD be so that no more than 30 vehicles pass on any road? D 20

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