Question

What was the initial amount of fuel, in gallons, if there are now $x$ gallons, $y$ gallons were pumped into a storage tank, and then $50$ gallons were added to the tank?

• A. $x+y+50$
• B. $x+y-50$
• C. $y-x+50$
• D. $x-y-50$

Answer 1

The correct option is B $x+y-50$

Let the initial amount be $A$.

After you've written your equation, solve for $A$.

Amount now $\left(x\right)=$ Initial amount $\left(A\right)$ minus $y$ plus $50$

$x=A-y+50$
$x+y-50=A$

Therefore, $x+y-50$