A rectangular wall with a length of 10x and width of 20 x has a rectangular doorway with a length of 5x and a width of 2x. What is the surface area of the wall?

∴ The the surface area of the wall is .

Step-by-step explanation:

Given that,

                 The length of rectangular wall is .

                 The width of rectangular wall is

                 The length of doorway is

                 The width of doorway is

and, we have to find the surface area of rectangular wall.

Now,

The length of rectangular wall is .

The width of rectangular wall is

∴ Total surface area of a rectangular wall

Total surface area of a rectangular wall is .

Again, The length of doorway is

           The width of doorway is

∴Total surface area of doorway

Total surface area of doorway is .

∴The remaining surface area of a rectangular wall is                                                                                                        

∴ The the surface area of the wall is .