The last one because the other ones only go to the positive side and not the negative too since the cube root
On 3 and 6 you did not clarify whether it is addition, subtraction, multiplication, or division.
Therefore, I have worked out all possible solutions.
If 2(3 - 6 x 3 - 5) then the solution is 12.<span>
If 2(3 + 6 x 3 - 5) then the solution is -36.</span><span>
If 2(3 / 6 x 3 - 5) then the solution is -2.
If 2(3 x 6 x 3 - 5) then the solution is -72.</span>
Let's plug the values and see which couple satisfy the equation: since 
, if we plug the values from the first option 
we have
which is correct.
If we plug the values from the second option 
we have
which is not correct
If we plug the values from the third option 
we have
which is not correct
If we plug the values from the fourth option 
we have
which is not correct
So, the answer is the first one.
If he only filled up five containers, then he would only have one and 1/4 gallons of oil
