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Trei carti au impreuna360 de pagini a doua are de 2 ori mai myltr decat prima.iar al treilea cu 60 mai mult decst primele foya





Răspuns :

a+b+c=360, b=2×a, c=a+b+60, a=50, b=2×50=100, c=50+100+60=210, 50 are prima, 100 are a doua, 210 are a treia.
x+y+z=360,Y=2X ,Z=X+Y+60,X+2X+Z=360,X+2X+X+Y+60=360, 4X+2X=360-60 ,6X=300 ,X=50,Y=2X50=100, Z=50+100+60=210