Respuesta :

Let:

x = gasoline tank capacity

a = gasoline in the tank

b = gallons needed to fill the tank

so:

[tex]\begin{gathered} x=15gal \\ a=15\cdot\frac{7}{10}=10.5 \end{gathered}[/tex]

Hence:

[tex]b=15-10.5=4.5gal[/tex]

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