Answer:
B. 3/5 gallons
Step-by-step explanation:
The ratio of the number of gallons of paint to the square feet of the wall is constant. So, we can write the following equation:
Where x is the number of gallons required to paint 423 square feet of the wall.
Then, solving for x, we get:
Therefore, he will need 3/5 gallons. So, the answer is:
B. 3/5 gallons