Question

A 15- gallon gasoline tank is7/10 full. How many gallons will it take to fill the tank?Pls help!!

Answer 1

Let:

x = gasoline tank capacity

a = gasoline in the tank

b = gallons needed to fill the tank

so:

$\begin{gathered} x=15gal \\ a=15\cdot\frac{7}{10}=10.5 \end{gathered}$

Hence:

$b=15-10.5=4.5gal$