A fish tank that holds $80$ gallons of water is $55\%$ full.  

1. Create a drawing like Louis’s in problem 5-4 to represent this situation.

   Answer (a):

   

2. How many gallons are in the tank now? How many more gallons are needed to fill the tank?

   Hint (b):

   Use equivalent ratios to solve this problem

   $\frac{x}{55} = \frac{80}{100}$

   Hint 2(b):

   Think about a Giant One that you could use to find the value of $x$.

   More Help (b):

   To find how many gallons are needed to fill the tank subtract the number of gallons in the tank now from the total number of gallons the tank holds.