Luisa compró 3 kg de manzana y se le cobró 3.45 euros, ¿Cuánto se le cobrará si quisiera comprar 8 k.... Question from @Greysxfer

【Rpta.】Se le cobrará 9.2 euros por 8 kilogramos.

[tex]{\hspace{50 pt}\above 1.2pt}\boldsymbol{\mathsf{Procedimiento}}{\hspace{50pt}\above 1.2pt}[/tex]

Para este caso utilizaremos regla de tres simple directa, ya que ambas magnitudes(kg y euros) son directamente proporcionales, entonces

Entonces

[tex]\mathsf{\:3\:kg \xrightarrow{\hspace{90pt}} 3.45\:euros}\\\mathsf{\:8\:kg \xrightarrow{\hspace{90pt}}\;\;\;\;\;\; \boldsymbol{\mathsf{x}}}[/tex]

[tex]\mathsf{\hspace{1 pt}(3\:kg)(x) =(3.45\:euros)(8\:kg)}\\\\\\\mathsf{\:\:\:\:\:\:\hspace{1 pt}x =\dfrac{(3.45\:euros)(8\:kg\hspace{-12pt}\dfrac{\hspace{0.4cm}}{~})}{(3\:kg\hspace{-12pt}\dfrac{\hspace{0.4cm}}{~})}}\\\\\\\mathsf{\:\:\hspace{1 pt}\:\:\:\:\:\:\:\boxed{\boxed{\boldsymbol{\mathsf{x=9.2\: euros}}}}}[/tex]

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