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Pan y:$250
x+y=85
x(1.50)+y(2.50)=177.50
x=85-y
(85-y)(1.50)+2.50y=177.50
127.5-1.50y+2.50y=177.50
y=177.50-127.5
y=50
x=85-50
x=35
Solucion:
x=35
y=50
Espero que sirva!Saludos!