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Bollo = Y
Ecuaciones:
3X + 6Y = 4.80 (1)
6X + 3Y = 4.20 (2)
De (1) se tiene
X= 1.6-2Y (3)
(3) en (2)
6*(1.6-2Y) + 3Y = 4.20
9.6-12Y +3Y =4.20
-9Y=-5.4
Y=0.6 (4)
(4) en (1)
3X + 6(0.6) = 4.80
X=0.4
R// las Barras de Pan cuestan 0.4 y el Bollos cuestan 0.6