Answer:
4725 square feet of wall area could be covered with 21 gallons of paint.
Step-by-step explanation:
Given: 7 gallons of paint will cover 1575 sq ft of wall area.
We have to fine the wall area that could be covered with 21 gallons of paint.
Unitary method is a method in which we first find the value of a unit quantity and then multiply it with the desired quantity.
7 gallon of paint need to cover area = 1575 ft²
1 gallon of paint cover area = [tex]\frac{1575}{7}[/tex] ft²
Thus, 21 gallon of paint cover area = [tex]\frac{1575}{7}\times 21=225 \times 21[/tex] ft²
21 gallon of paint cover area = [tex]225 \times 21=4725[/tex] ft²
Thus, 4725 square feet of wall area could be covered with 21 gallons of paint.
