Find the whole using the percent equation.
20 patients is 80% of what number of patients?
Let's call the whole number of patients X.
According to the percent equation, we can set up the equation:
20 = 0.8X
To find the value of X, divide both sides of the equation by 0.8:
20/0.8 = X
X = 25
Therefore, 20 patients is 80% of 25 patients.