Răspuns:
Fie x-numarul de metri de stofa de calitatea intai si y-numarul de metri de stofa de calitatea a doua
x+y=432
(x-44)*36+(y-68)*25=9870
36*x-1584+25*y-1700=9870
36*x+25*y=13154
Avand
x+y=432 rezulta x=432-y
36*x+25*y=13154
36*(432-y)+25*y=13154
15552-36*y+25*y=13154
-11*y=-2398
y=218 metri
x=432-218=214 metri
