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1.50x+1.25y = 69.25
1.50 (50-y)+1.25y = 69.25
75-1.50y+1.25y = 69.25
-0,25y = 69.25-75
-0,25y = -5,75
y = 5,75/0,25=23 (refresco)
x= 50-23= 27 yogurt