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5.2: Proporciones
https://espanol.libretexts.org/Vocacional/Tecnologia_de_Sistemas_de_Agua/Matem%C3%A1ticas_para_la_gesti%C3%B3n_de_aguas_residuales_(Brooks)/05%3A_Ratios%2C_Proporciones_y_Porcentajes/5.02%3A_Proporciones
\[\begin{align*} \dfrac{\text{Number of pounds of hypochlorite}}{\text{Number of gallons of water}}&=\dfrac{\text{Number of pounds of hypochlorite}}{\text{Number of gallons of water}} \\[4pt] \dfrac{4... $\begin{align*} \dfrac{\text{Number of pounds of hypochlorite}}{\text{Number of gallons of water}}&=\dfrac{\text{Number of pounds of hypochlorite}}{\text{Number of gallons of water}} \\[4pt] \dfrac{4.8\, \text{lbs}}{70\, \text{gal}} &=\dfrac{x\, \text{lbs}}{20\, \text{gal}} \\[4pt] \left(4.8 \, \text{lbs}\right)\left(20\, \text{gal}\right) &=\left(70\, \text{gal}\right)\left(x \, \text{lbs}\right) \\[4pt] 96 &=70x \\[4pt] \dfrac{96}{70} &=x \\[4pt] x &=1.4\, \text{lbs} \end{align*}$

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