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A fish tank that holds gallons of water is full.  

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

    A line segment, from 0% to 100%, with two unequal sections. A bracket includes the first section labeled, x gal, and 55%. Labeled above the 100%, 80 gallons.

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

    Use equivalent ratios to solve this problem

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

    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.