Verified Answer :

Rubaduba

divide 13.5 by 5
=2.7
then multiply 2.7 by 4
=10.8
so the tank has 10.8 gallons when 4/5 full
it takes 2.7 more gallons to fill the tank.
a simpler way would be to just divide by 5 and that would get the answer, but if you needed to know how many gallons were already in the tank, the way i showed up there would work.

calculista

we know that

if the gasoline tank is \(\frac{4}{5}\) full

then

\(\frac{5}{5} -\frac{4}{5} =\frac{1}{5}\)

So

Multiply \(13.5\ gal\) by \(\frac{1}{5}\) to know
the number of gallons required to fill it

\(13.5*\frac{1}{5} =\frac{13.5}{5} \\ \\ =2.7\ gallons\)

therefore

the answer is

\(2.7\ gallons\)

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