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Docena + media =
12 + 6 = 18 caramelos
Por regla de 3.
3 car---------> s/.1
18car---------> x
x =(s/. 1 * 18car)/ 3car
x = (s/. 18)/3
x = s/. 6
Respuesta.
Los 18 caramelos cuestan s/. 6