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Si 200 esferográficos se venden a $ 100
¿Cual será el precio de 12 esferograficos?
200 ------------------ $ 100
12 ------------------- $ X
Relacionamos de la sgte. manera: 200 * X = 12 * 100
200 X = $ 1 200
X = $ 1 200 / 200
X = $ 6