Respuesta:
[tex] \frac{x}{4} + \frac{80}{1} = \frac{9x}{20} \\ (\frac{x + 320}{4} ) = \frac{9x}{20} \\ 5x - 5x + 320 \times 5 = 9x - 5x \\ 320 \times 5 = 4x \\ x = 400litros[/tex]
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Respuesta:
[tex] \frac{x}{4} + \frac{80}{1} = \frac{9x}{20} \\ (\frac{x + 320}{4} ) = \frac{9x}{20} \\ 5x - 5x + 320 \times 5 = 9x - 5x \\ 320 \times 5 = 4x \\ x = 400litros[/tex]