Given
Tank currently filled = 1/3
gallons added in order to fill the tank = 16
Find
Number of gallons needed to fill the tank.
Step-by-step explanation
Let number of gallons need to fill the tank = x
currently filled with gallons = 1/3x
added to fill = 16
according to the question

Final Answer
Therefore , the 24 gallons the tank hold when it is full.