OG详解-OG2 数学1 Q26

Choice A is correct. It’s given that  w  represents the total wall area, in square feet. Since the walls of the room will be painted twice, the amount of paint, in gallons, needs to cover 2w square feet. It’s also given that one gallon of paint will cover 220  square feet. Dividing the totalarea, in square feet, of the surface to be painted by the number of square feet covered by one gallon of paint gives the  number of gallons of paint that will be needed. Dividing 2w  by 220 yields 2w220​​, or w11​0​. Therefore, the equation that represents the total amount of paint  P, in gallons, needed to paint the walls of the room twice is  P = w11​0​ .
Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from finding the amount of paint needed to paint the walls once rather than twice. Choice D is incorrect and may result from conceptual or calculation errors.