Answer: 4 gallons
Step-by-step explanation:
From the graph , it can be seen that
For 4 gallons of black paint , the number of gallons of white paint were mixed = 16 gallons.
Also 8 gallons of black paint , the number of gallons of white paint were mixed = 32 gallons.
Since the points are forming a line , that means the rate of change must be constant.
Therefore, the number of gallon of white paint mixed with 1 gallon of black paint :
Hence, the number of gallons of white paint mixed with 1 gallon of black paint is 4 gallons.