Answer
2.857 gallons
Work Step by Step
Given if each gallon of paint covers approximately 105 $ft^{2}$
To find out number of gallons required to paint the wall
Lets take proportionality condition
$\frac{1 gallon}{105 ft^{2}}$ = $\frac{x gallon}{300 ft^{2}}$
x * 105 = 300 * 1
x = $\frac{300}{105}$ = 2.857 gallons
